Fatal error: Uncaught Error: Class 'Tinebase_Model_Filter_Abstract' not found in /home/compute1/public_html/tine.computerfee-server.de/HumanResources/Model/AccountQuicksearchFilter.php:17 Stack trace: #0 {main} thrown in /home/compute1/public_html/tine.computerfee-server.de/HumanResources/Model/AccountQuicksearchFilter.php on line 17