Instructor 101: Great Classroom Activities
Error message
Warning: Undefined array key 0 in Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processHtmlHeadLink() (line 445 of core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php).
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processHtmlHeadLink() (Line: 199) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 214) Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 202) 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: 45) Drupal\services\StackMiddleware\FormatSetter->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: 34)
Warning: Trying to access array offset on null in Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processHtmlHeadLink() (line 452 of core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php).
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processHtmlHeadLink() (Line: 199) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 214) Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 202) 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: 45) Drupal\services\StackMiddleware\FormatSetter->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: 34)
Warning: Trying to access array offset on null in Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processHtmlHeadLink() (line 453 of core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php).
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processHtmlHeadLink() (Line: 199) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 214) Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 202) 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: 45) Drupal\services\StackMiddleware\FormatSetter->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: 34)