Mautic is not open in browser - site is offline

My Mautic version is: 4.4.9
My PHP version is: 8.0
My Database type and version is: MySQL Version 8.0.33

Your problem
My problem is:
Mautic is inaccessible with the error message on “ The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.
Steps I have tried to fix the problem:

  • Clear cache in var/cache
  • run command line in terminal to clear cache
  • view in new incognitio mode
  • delete cookies

Check to see if you’re using the right php version.
Check also folder permissions.

Hii @tobsowo Thank you for message
I am php version is 8.2 and i am using below command
sudo chown -R root:root /var/lib/php/sessions
sudo chmod 700 /var/lib/php/sessions

output:
drwx------ 2 root root 135168 Jun 28 07:09 /var/lib/php/sessions

These errors are showing in the Mautic log

[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_hoir6dv6v27ui66ovqeo03rohb, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_ebnipo6bvpsav0eua54vbav464, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_fv3s5ktshdjt2joubl9qn0s06q, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":266318}
[2024-06-28 02:49:29] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":266318}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_5jiijo88f5v2idr11pbhnbru0m, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_q7t0ibesi7f2r3ibldh1qt73cs, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_lr33pgducqeab4iffi5je7utvj, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":267120}
[2024-06-28 03:36:53] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":267120}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_cu8l20qudnnluj7m6m88493fgp, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_le4ucu0jukkfbcp9bg2a6kneum, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_lmkkqbgmhqva0hsm1c956c6fks, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":268103}
[2024-06-28 04:22:47] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":268103}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_4klrutgajgi4fkff3ggnqvodlf, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_72k1vaoasdgiotseenrqf4v88u, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_6kejfi6oqt2v1s12d8n6jtbsrl, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":268936}
[2024-06-28 05:09:49] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":268936}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_c9lumhbnas96i4juhhahg1ui5d, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_b8snpud4v97dj3u49ib2psorqg, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_t1ljp08lvj5khg6e3h8qqh2dcm, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:00:02] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":269441}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_41a6r32sf2adf1pubhdc42ueo4, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_ncs7stei60rpor50vs2pbrkf2v, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_sk3vpq5h8bvubj6hf5o9n51njo, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":269800}
[2024-06-28 06:17:36] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":269800}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_k2lt7tb8k7q7mdvg1vgsh9l9br, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_n2c28ldn804rau36at10prqc2e, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_t6e7ldv9eflb1tei54cp97iign, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:02:42] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":271833}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_tnikar2h6q0apj89iotihsui44, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.CRITICAL: Uncaught PHP Exception RuntimeException: "Failed to start the session." at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157 {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_1agvl7tc28sm9kimp8kcjn5656, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_6j7pc2bd77f2nh6e9ek9j0ufde, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.CRITICAL: Exception thrown when handling an exception (RuntimeException: Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php line 157) {"exception":"[object] (RuntimeException(code: 0): Failed to start the session. at /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:157)"} {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.WARNING: PHP Warning - Undefined variable $inline - in file /home/aitorch-em/htdocs/em.aitorch.com/offline.php - at line 77 [] {"hostname":"403872","pid":272422}
[2024-06-28 09:19:00] mautic.ERROR: RuntimeException: Failed to start the session. - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 157 [] {"hostname":"403872","pid":272422}
[2024-06-28 10:06:40] mautic.WARNING: PHP Warning - SessionHandler::read(): open(/var/lib/php/sessions/sess_050imqemnp7l6hjrnts2qcavnh, O_RDWR) failed: Permission denied (13) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php - at line 49 [] {"hostname":"403872","pid":272893}
[2024-06-28 10:06:40] mautic.WARNING: PHP Warning - session_start(): Failed to read session data: user (path: 0;777;/var/lib/php/sessions) - in file /home/aitorch-em/htdocs/em.aitorch.com/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php - at line 156 [] {"hostname":"403872","pid":272893}

8.2 is only supported from 5.1 and later.

See: Requirements - Mautic Community

sorry @rcheesley I am using 7.4 php version