Error pages in multi site setup I have a multi site setup for supporting multiple languages in Craft 3.

'/' =&gt; German
'/en/' =&gt; English

In my general.php I have 'errorTemplatePrefix' =&gt; 'error/',

When I enter '/notexisting', my error/error.twig gets called. But when I enter '/en/notexisting', then the default Craft error message gets displayed "Page Not Found, Template not found: notexisting"

How do I get my error.twig called also for other sites?
There are several things that might be the issue in such cases, I'll list a few of them


Did you change your index.php so maybe Craft is unable to detect the current site?
Are there different index.php files in different folders in order to do the multisite setup instead of the single one? -> You should only have one for all
Do you have any plugins that might interfer and offer their custom error page / error behaviors?
Do you have any other events in your own custom plugin/module that includes a custom error handling?
Is your error template in the templates roots folder and not in a site/site group subfolder so Craft only selects it for a single site instead of globally?
Make sure dev mode is off