Fatal error: Uncaught Error: Interface 'League\CommonMark\Block\Element\StringContainerInterface' not found in D:\xampp\htdocs\vendor\league\commonmark\src\Block\Element\InlineContainerInterface.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\vendor\league\commonmark\src\Block\Element\InlineContainerInterface.php on line 17