Fatal error: Uncaught Error: Class "Knp\Snappy\AbstractGenerator" not found in C:\WebServer\htdocs\bookshelf\vendor\knplabs\knp-snappy\src\Knp\Snappy\Image.php:11 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\knplabs\knp-snappy\src\Knp\Snappy\Image.php on line 11