Custom error page

By default, if some unexpected error happens, Drupal will show a page with the text "The website encountered an unexpected error. Please try again later". This is not very user-friendly and it is not elegant.

The mix module comes with some configurations to help you replace the default error page with custom messages or a well-designed HTML page.

Configurations

• Visit the /admin/config/mix page
• Find and check the "Enable custom error page" checkbox.
• (Optional) Click "View current error page" to see the error page.
• Change the content of the "Error page content" field with your custom messages or HTML code (or just leave it untouched to use an error page like the one in the right part of the above screenshot) 
• Click the "Save configuration" button.
• (Optional) Click "View current error page" to see the error page.