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Error adding new contestants to page. An error has occurred. 0 Call to undefined method Joomla\CMS\Application\AdministratorApplication::isSite() Call stack # Function Location 1 () JROOT/plugins/competition/notifications/notifications.php:218 2 PlgCompetitionNotifications->onParticipantBeforeSave() JROOT/libraries/src/Plugin/CMSPlugin.php:284 3 Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() JROOT/libraries/vendor/joomla/event/src/Dispatcher.php:486 4 Joomla\Event\Dispatcher->dispatch() JROOT/libraries/src/Application/EventAware.php:111 5 Joomla\CMS\Application\WebApplication->triggerEvent() JROOT/libraries/src/MVC/Model/AdminModel.php:1258 6 Joomla\CMS\MVC\Model\AdminModel->save() JROOT/administrator/components/com_competition/models/participant.php:530 7 CompetitionModelParticipant->save() JROOT/administrator/components/com_competition/controllers/participant.php:230 8 CompetitionControllerParticipant->save() JROOT/libraries/src/MVC/Controller/BaseController.php:678 9 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/administrator/components/com_competition/competition.php:49 10 require_once() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:71 11 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:73 12 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361 13 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:143 14 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:186 15 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:293 16 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:61 17 require_once() JROOT/administrator/index.php:32 Joomla 4.3.3 PHP 8.0.24 Page previously was updated from J3.x

Works like a charm.

Thanks for excellent support.