The website encountered an unexpected error.

After updating Drupal Core if you encountered error displayed in image above make sure you have cleared the cache.

This is also possible that you can’t access the /admin/config therefore access performance link directly at this url /admin/config/development/performance

In my case I upgraded Drupal Core and got The website encountered an unexpected error upon accessing the /admin/config.

In order to understand the cause of this issue, I added following line of code to the sites/default/settings.php


And issue was resolved by simply clearing the cache, in your case error could be different.

Author: Danyal
I'm working as programmer since 2002. Born, grew up, studied and worked in Pakistan now Im located in Denmark since 2006.