Fatal error: Uncaught Error: Interface "League\Config\ConfigurationProviderInterface" not found in C:\WebServer\htdocs\bookshelf\vendor\league\commonmark\src\Environment\EnvironmentBuilderInterface.php:28 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\vendor\league\commonmark\src\Environment\EnvironmentBuilderInterface.php on line 28