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