Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in /users/danielstruebig/www/firma/vendor/guzzlehttp/guzzle/tests/TestLogger.php:12 Stack trace: #0 {main} thrown in /users/danielstruebig/www/firma/vendor/guzzlehttp/guzzle/tests/TestLogger.php on line 12