Fatal error: Uncaught Error: Interface 'League\CommonMark\Block\Parser\BlockParserInterface' not found in C:\xampp\htdocs\admin\vendor\league\commonmark\src\Extension\TableOfContents\TableOfContentsPlaceholderParser.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\league\commonmark\src\Extension\TableOfContents\TableOfContentsPlaceholderParser.php on line 21