Fatal error: Uncaught Error: Class "Sabre\VObject\ITip\BrokerTester" not found in /var/www/illumine/vendor/sabre/vobject/tests/VObject/ITip/BrokerSignificantChangesTest.php:5 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/vobject/tests/VObject/ITip/BrokerSignificantChangesTest.php on line 5