Fatal error: Uncaught Error: Interface 'League\CommonMark\Extension\ExtensionInterface' not found in C:\Apache24\htdocs\vendor.old2\league\commonmark\src\Extension\GithubFlavoredMarkdownExtension.php:23 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\vendor.old2\league\commonmark\src\Extension\GithubFlavoredMarkdownExtension.php on line 23