# After migration not able to upload in elfinder, showing error

**URL:** <https://forum.mautic.org/t/after-migration-not-able-to-upload-in-elfinder-showing-error/31470>\
**Category:** Product Support\
**Created:** [March 28, 2024, 4:58am UTC](https://forum.mautic.org/t/after-migration-not-able-to-upload-in-elfinder-showing-error/31470 "2024-03-28T04:58:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![shishir](https://avatars.discourse-cdn.com/v4/letter/s/9de0a6/32.png) [@shishir](https://forum.mautic.org/u/shishir)\
**Post date:** [March 28, 2024, 4:58am UTC](https://forum.mautic.org/t/after-migration-not-able-to-upload-in-elfinder-showing-error/31470/1 "2024-03-28T04:58:55Z")

</div>

**Your software**  
My Mautic version is: 4.4.10  
My PHP version is:8.0  
My Database type and version is:

while uploading in the media manager showing server error 500.

Invalid backend response.  
An error occurred on the server side.  
HTTP error 500

error log is this

PHP Warning: Invalid callback elFinderSession::session\_start\_error, cannot access protected method elFinderSession::session\_start\_error() /public\_html/vendor/symfony/http-foundation/Session/Storage/Handler/StrictSessionHandler.php on line 106

 ![image](https://us1.discourse-cdn.com/flex020/uploads/mautic/original/2X/b/b63e7efe0f724a7cc20342dbd324a00f415d1ca4.png)