PHP:
Fatal error: Uncaught Error: Class "Psr\Log\AbstractLogger" not found in /www/habi.gna.ch/doc/u/includes/vendor/psr/log/Psr/Log/NullLogger.php:13
Stack trace:
#0 {main}
thrown in /www/habi.gna.ch/doc/u/includes/vendor/psr/log/Psr/Log/NullLogger.php on line 13