Fatal error: Uncaught Error: Class 'Psr\Log\AbstractLogger' not found in /opt/lampp/htdocs/vendor/psr/log/Psr/Log/Test/TestLogger.php:57 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/vendor/psr/log/Psr/Log/Test/TestLogger.php on line 57