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Error: Call to a member function isEmpty() on null in Drupal\bosco_mod\Controller\Calendar->generate() (line 21 of modules/custom/bosco_mod/src/Controller/Calendar.php).
Drupal\bosco_mod\Controller\Calendar->generate() call_user_func_array() (Line: 123) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 573) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 124) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97) Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 158) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 80) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 57) Drupal\Core\StackMiddleware\Session->handle() (Line: 47) 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: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 52) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 23) Stack\StackedHttpKernel->handle() (Line: 705) Drupal\Core\DrupalKernel->handle() (Line: 19)