Fatal error: Uncaught Error: Interface "League\CommonMark\Extension\FrontMatter\Data\FrontMatterDataParserInterface" not found in C:\www\Apache24\htdocs\agenda-dif\vendor\league\commonmark\src\Extension\FrontMatter\Data\LibYamlFrontMatterParser.php:19 Stack trace: #0 {main} thrown in C:\www\Apache24\htdocs\agenda-dif\vendor\league\commonmark\src\Extension\FrontMatter\Data\LibYamlFrontMatterParser.php on line 19