Fatal error: Uncaught Error: Class 'Tinebase_Model_Filter_FilterGroup' not found in /home/compute1/public_html/tine.computerfee-server.de/SimpleFAQ/Model/FaqFilter.php:15 Stack trace: #0 {main} thrown in /home/compute1/public_html/tine.computerfee-server.de/SimpleFAQ/Model/FaqFilter.php on line 15