Er is onverwacht een fout opgetreden. Probeer het later nog eens.
Drupal\Core\Asset\Exception\InvalidLibrariesExtendSpecificationException: The specified library "classy/file" does not exist. in Drupal\Core\Asset\LibraryDiscoveryCollector->applyLibrariesExtend() (line 154 of core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php).
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibraryDefinitions('file') (Line: 66) Drupal\Core\Asset\LibraryDiscoveryCollector->resolveCacheMiss('file') (Line: 149) Drupal\Core\Cache\CacheCollector->get('file') (Line: 44) Drupal\Core\Asset\LibraryDiscovery->getLibrariesByExtension('file') (Line: 58) Drupal\Core\Asset\LibraryDiscovery->getLibraryByName('file', 'drupal.file') (Line: 68) Drupal\Core\Asset\LibraryDependencyResolver->doGetDependencies(Array, Array) (Line: 70) Drupal\Core\Asset\LibraryDependencyResolver->doGetDependencies(Array) (Line: 41) Drupal\Core\Asset\LibraryDependencyResolver->getLibrariesWithDependencies(Array) (Line: 87) Drupal\Core\Asset\LibraryDependencyResolver->getMinimalRepresentativeSubset(Array) (Line: 112) Drupal\Core\Asset\AssetResolver->getLibrariesToLoad(Object) (Line: 130) Drupal\Core\Asset\AssetResolver->getCssAssets(Object, 1, Object) (Line: 320) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries(Object, Array) (Line: 164) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments(Object) (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object) call_user_func(Array, Object, 'kernel.response', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.response') (Line: 214) Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 160) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)