Error message
- Warning: Invalid argument supplied for foreach() in Drupal\Core\Theme\Registry->processExtension() (line 470 of core/lib/Drupal/Core/Theme/Registry.php).
- Warning: Invalid argument supplied for foreach() in Drupal\Component\Utility\NestedArray::mergeDeepArray() (line 327 of core/lib/Drupal/Component/Utility/NestedArray.php).