Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in /users/energydata/www/volkszaehler.org/vendor/symfony/error-handler/BufferingLogger.php:21 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/symfony/error-handler/BufferingLogger.php on line 21