Fatal error: Uncaught Error: Class "PHPePub\Core\Logger" not found in /home/sylvainlj/bag/vendor/grandt/phpepub/tests/EPub.Example3.php:20 Stack trace: #0 {main} thrown in /home/sylvainlj/bag/vendor/grandt/phpepub/tests/EPub.Example3.php on line 20