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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() (Line: 34)
Drupal\views\Plugin\views\argument\YearMonthDate->title() (Line: 1000)
Drupal\views\Plugin\views\argument\ArgumentPluginBase->getTitle() (Line: 1115)
Drupal\views\ViewExecutable->_buildArguments() (Line: 1272)
Drupal\views\ViewExecutable->build() (Line: 392)
Drupal\views\Plugin\views\display\PathPluginBase->execute() (Line: 196)
Drupal\views\Plugin\views\display\Page->execute() (Line: 1635)
Drupal\views\ViewExecutable->executeDisplay() (Line: 81)
Drupal\views\Element\View::preRenderViewElement()
call_user_func_array() (Line: 101)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 788)
Drupal\Core\Render\Renderer->doCallback() (Line: 374)
Drupal\Core\Render\Renderer->doRender() (Line: 204)
Drupal\Core\Render\Renderer->render() (Line: 242)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 243)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 132)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray()
call_user_func() (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 174)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 81)
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: 23)
Stack\StackedHttpKernel->handle() (Line: 718)
Drupal\Core\DrupalKernel->handle() (Line: 19)