Error message
Warning: Array to string conversion in Drupal\Core\Theme\ThemeInitialization->getActiveTheme() (line 169 of core/lib/Drupal/Core/Theme/ThemeInitialization.php).
Drupal\Core\Theme\ThemeInitialization->getActiveTheme() (Line: 120) Drupal\Core\Theme\ThemeInitialization->getActiveThemeByName() (Line: 73) Drupal\Core\Theme\ThemeInitialization->initTheme() (Line: 415) Drupal\Core\Theme\ThemeManager->initTheme() (Line: 95) Drupal\Core\Theme\ThemeManager->getActiveTheme() (Line: 230) Drupal\Core\Theme\Registry->init() (Line: 317) Drupal\Core\Theme\Registry->getRuntime() (Line: 194) Drupal\Core\Entity\EntityViewBuilder->getBuildDefaults() (Line: 61) Drupal\node\NodeViewBuilder->getBuildDefaults() (Line: 157) Drupal\Core\Entity\EntityViewBuilder->viewMultiple() (Line: 123) Drupal\Core\Entity\EntityViewBuilder->view() (Line: 134) Drupal\Core\Entity\Controller\EntityViewController->view() (Line: 66) Drupal\node\Controller\NodeViewController->view() call_user_func_array() (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 121) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 201) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87) Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 741) Drupal\Core\DrupalKernel->handle() (Line: 19)