Clicking Cancel event button, as shown in above screenshot, gives an error of ...
TypeError: Return value of NF\Calendar\Service\Event\Notifier::getResponseTypes() must be of the type array, null returned in src/addons/NF/Calendar/Service/Event/Notifier.php at line 137
- NF\Calendar\Service\Event\Notifier->getResponseTypes() in src/addons/NF/Calendar/Service/Event/Notifier.php at line 188
- NF\Calendar\Service\Event\Notifier->loadNotifiers() in src/XF/Service/AbstractNotifier.php at line 251
- XF\Service\AbstractNotifier->getNotifiers() in src/XF/Service/AbstractNotifier.php at line 179
- XF\Service\AbstractNotifier->addNotifications() in src/addons/NF/Calendar/Service/Event/Notifier.php at line 219
- NF\Calendar\Service\Event\Notifier->setRespondedUserIds() in src/addons/NF/Calendar/Service/Event/Canceller.php at line 153
- NF\Calendar\Service\Event\Canceller->sendNotifications() in src/addons/NF/Calendar/Pub/Controller/Event.php at line 730
- NF\Calendar\Pub\Controller\Event->actionCancel() in src/XF/Mvc/Dispatcher.php at line 350
- XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 257
- XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 113
- XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 55
- XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2326
- XF\App->run() in src/XF.php at line 488
- XF::runApp() in index.php at line 20