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TypeError: Drupal\Core\Extension\ThemeHandler::addTheme(): Argument #1 ($theme) must be of type Drupal\Core\Extension\Extension, null given, called in /usr/share/kara-webdesign/web/core/includes/theme.maintenance.inc on line 70 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 82 of core/lib/Drupal/Core/Extension/ThemeHandler.php).
Drupal\Core\Extension\ThemeHandler->addTheme() (Line: 70)
_drupal_maintenance_theme() (Line: 322)
drupal_maintenance_theme() (Line: 163)
Drupal\Core\EventSubscriber\MaintenanceModeSubscriber->onMaintenanceModeRequest()
call_user_func() (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 123)
Drupal\Core\EventSubscriber\MaintenanceModeSubscriber->onKernelRequestMaintenance()
call_user_func() (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 239)
Symfony\Component\HttpKernel\HttpKernel->handleThrowable() (Line: 91)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 191)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 128)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 82)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 704)
Drupal\Core\DrupalKernel->handle() (Line: 19)