Fatal error: Uncaught Error: Interface 'League\CommonMark\Extension\ExtensionInterface' not found in D:\xampp\htdocs\psp\backend\vendor\league\commonmark\src\Extension\ConfigurableExtensionInterface.php:18 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\league\commonmark\src\Extension\ConfigurableExtensionInterface.php on line 18