Fatal error: Uncaught Symfony\Component\Filesystem\Exception\IOException: Failed to write file "/var/www/vhosts/stoffe-werning.de/httpdocs/custom/plugins/OntiusSimpleSearch/var/cache/ProductFinder_Db_Shop_1_Key_EK.txt". in /var/www/vhosts/stoffe-werning.de/httpdocs/vendor/symfony/filesystem/Filesystem.php:691 Stack trace: #0 /var/www/vhosts/stoffe-werning.de/httpdocs/custom/plugins/OntiusSimpleSearch/Components/AjaxSearcherCacheHandler.php(72): Symfony\Component\Filesystem\Filesystem->dumpFile() #1 /var/www/vhosts/stoffe-werning.de/httpdocs/custom/plugins/OntiusSimpleSearch/Subscribers/FrontendController.php(118): OntiusSimpleSearch\Components\AjaxSearcherCacheHandler->saveAjaxSearcherInCache() #2 /var/www/vhosts/stoffe-werning.de/httpdocs/engine/Library/Enlight/Event/Handler/Default.php(90): OntiusSimpleSearch\Subscribers\FrontendController->onPostDispatchFrontend() #3 /var/www/vhosts/stoffe-werning.de/httpdocs/engine/Library/Enlight/Event/EventManager.php(207): Enlight_Event_Handler_Default->execute() #4 /var/www/vhosts in /var/www/vhosts/stoffe-werning.de/httpdocs/vendor/symfony/filesystem/Filesystem.php on line 691