InvalidArgumentException: The timestamp must be numeric. in Drupal\Component\Datetime\DateTimePlus::createFromTimestamp() (line 201 of core/lib/Drupal/Component/Datetime/DateTimePlus.php).
Drupal\Core\Datetime\DateFormatter->format(NULL, 'custom', 'Y-m-d\TH:i:s') (Line: 53)
Drupal\drowl_media\Plugin\media\Source\Slideshow->getMetadata(Object, 'default_name') (Line: 99)
Drupal\media\Entity\Media->getName() (Line: 109)
Drupal\media\Entity\Media->label() (Line: 355)
Drupal\Core\Entity\Plugin\EntityReferenceSelection\DefaultSelection->getReferenceableEntities(NULL, 'CONTAINS', 50) (Line: 305)
Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem::generateSampleValue(Object) (Line: 253)
Drupal\Core\Field\FieldItemList->generateSampleItems() (Line: 248)
Drupal\Core\Entity\ContentEntityStorageBase->createWithSampleValues('news_neuigkeit') (Line: 55)
Drupal\layout_builder\Entity\LayoutBuilderSampleEntityGenerator->get('node', 'news_neuigkeit') (Line: 229)
Drupal\layout_builder\Plugin\SectionStorage\DefaultsSectionStorage->getContextsDuringPreview() (Line: 71)
Drupal\layout_builder\Element\LayoutBuilder->getPopulatedContexts(Object) (Line: 236)
Drupal\layout_builder\Element\LayoutBuilder->buildAdministrativeSection(Object, 0) (Line: 124)
Drupal\layout_builder\Element\LayoutBuilder->layout(Object) (Line: 98)
Drupal\layout_builder\Element\LayoutBuilder->preRender(Array)
call_user_func_array(Array, Array) (Line: 101)
Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See
https://www.drupal.org/node/2966725 →
', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 788)
Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 374)
Drupal\Core\Render\Renderer->doRender(Array) (Line: 446)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array, ) (Line: 242)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 243)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 132)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 174)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
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: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 50)
Drupal\ban\BanMiddleware->handle(Object, 1, 1) (Line: 270)
Drupal\shield\ShieldMiddleware->bypass(Object, 1, 1) (Line: 226)
Drupal\shield\ShieldMiddleware->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: 49)
Drupal\remove_http_headers\StackMiddleware\RemoveHttpHeadersMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 713)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)