Fatal error: Uncaught Error: Interface "League\CommonMark\Extension\ExtensionInterface" not found in D:\Apache24\www\pda\vendor\league\commonmark\src\Extension\Strikethrough\StrikethroughExtension.php:17 Stack trace: #0 {main} thrown in D:\Apache24\www\pda\vendor\league\commonmark\src\Extension\Strikethrough\StrikethroughExtension.php on line 17