# \[Solved\] 500 error on installation after submitting db credentials details

**URL:** https://forum.mautic.org/t/solved-500-error-on-installation-after-submitting-db-credentials-details/17577
**Category:** Product Support
**Created:** [December 26, 2020, 9:42pm UTC](https://forum.mautic.org/t/solved-500-error-on-installation-after-submitting-db-credentials-details/17577 "2020-12-26T21:42:29Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![tanaysai](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/tanaysai/32/4163_2.png) [@tanaysai](https://forum.mautic.org/u/tanaysai)
#### Post date: [December 26, 2020, 9:42pm UTC](https://forum.mautic.org/t/solved-500-error-on-installation-after-submitting-db-credentials-details/17577/1 "2020-12-26T21:42:29Z")

</div>

**Your software**  
My Mautic version is: 3.2.1  
My PHP version is: PHP/7.2.34  
Server: Apache/2.4.38  
My Database type and version is: mysql:5.7

**Your problem**  
My problem is: 500 error on installation after submitting db credentials details

**These errors are showing in the log:**

**PHP/Apache Logs**

```
php_1 | [Sat Dec 26 21:18:57.308116 2020] [php7:warn] [pid 27] [client 172.18.0.1:56116] PHP Warning: Cannot use a scalar value as an array in /var/www/html/app/bundles/InstallBundle/Install/InstallService.php on line 337, referer: http://localhost/index.php/installer/step/1
php_1 | 172.18.0.1 - - [26/Dec/2020:21:18:56 +0000] "POST /index.php/installer/step/1 HTTP/1.1" 500 61062 "http://localhost/index.php/installer/step/1" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:84.0) Gecko/20100101 Firefox/84.0"

```

**Mautic Logs:**

```
[2020-12-26 21:18:57] mautic.CRITICAL: Uncaught PHP Exception Doctrine\DBAL\Exception\ConnectionException: "An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory" at /var/www/html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php line 93 {"exception":"[object] (Doctrine\\DBAL\\Exception\\ConnectionException(code: 0): An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory at /var/www/html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:93, Doctrine\\DBAL\\Driver\\PDOException(code: 2002): SQLSTATE[HY000] [2002] No such file or directory at /var/www/html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:31, PDOException(code: 2002): SQLSTATE[HY000] [2002] No such file or directory at /var/www/html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:27)"} [] 

```

**Steps I have tried to fix the problem:**

- None yet

---

<div class="post-metadata">

### Author: ![tanaysai](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/tanaysai/32/4163_2.png) [@tanaysai](https://forum.mautic.org/u/tanaysai)
#### Post date: [December 26, 2020, 9:44pm UTC](https://forum.mautic.org/t/solved-500-error-on-installation-after-submitting-db-credentials-details/17577/2 "2020-12-26T21:44:30Z")

</div>

Looks like unrelated to Mautic (although exception could have been handled better in Mautic).

MySQL connection couldn’t be established.

If you are using docker with 2 different containers each for php and mysql, try giving **host.docker.internal** instead of **localhost or 127.0.0.1 or 0.0.0.0**

That worked.