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InvalidArgumentException: Invalid translation language (en) specified. in Drupal\Core\Entity\ContentEntityBase->getTranslation() (line 874 of core/lib/Drupal/Core/Entity/ContentEntityBase.php).
getNodeByExposition('1973', 'en') (Line: 47)
Drupal\itgallery_ws\Controller\ExhibitionsController->titleExposition('1973')
call_user_func_array(Array, Array) (Line: 58)
Drupal\Core\Controller\TitleResolver->getTitle(Object, Object) (Line: 843)
token_tokens('current-page', Array, Array, Array, Object)
call_user_func_array(Object, Array) (Line: 426)
Drupal\Core\Extension\ModuleHandler->Drupal\Core\Extension\{closure}(Object, 'token') (Line: 405)
Drupal\Core\Extension\ModuleHandler->invokeAllWith('tokens', Object) (Line: 433)
Drupal\Core\Extension\ModuleHandler->invokeAll('tokens', Array) (Line: 357)
Drupal\Core\Utility\Token->generate('current-page', Array, Array, Array, Object) (Line: 239)
Drupal\Core\Utility\Token->doReplace(1, '[current-page:title] | [site:name]', Array, Array, Object) (Line: 189)
Drupal\Core\Utility\Token->replace('[current-page:title] | [site:name]', Array, Array, NULL) (Line: 66)
Drupal\metatag\MetatagToken->replace('[current-page:title] | [site:name]', Array, Array) (Line: 769)
Drupal\metatag\MetatagManager->processTagValue(Object, Array, Array, , 'en') (Line: 615)
Drupal\metatag\MetatagManager->generateRawElements(Array, NULL) (Line: 547)
Drupal\metatag\MetatagManager->generateElements(Array, NULL) (Line: 520)
metatag_get_tags_from_route() (Line: 129)
metatag_page_attachments(Array) (Line: 313)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}(Object, 'metatag') (Line: 405)
Drupal\Core\Extension\ModuleHandler->invokeAllWith('page_attachments', Object) (Line: 314)
Drupal\Core\Render\MainContent\HtmlRenderer->invokePageAttachmentHooks(Array) (Line: 288)
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: 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: 50)
Drupal\ban\BanMiddleware->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: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)