Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in /var/www/illumine/vendor/sabre/dav/tests/Sabre/DAV/MockLogger.php:15 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/dav/tests/Sabre/DAV/MockLogger.php on line 15