Fatal error: Uncaught Error: Class 'Illuminate\Support\ServiceProvider' not found in /opt/lampp/htdocs/us/vendor/graham-campbell/markdown/src/MarkdownServiceProvider.php:37 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/graham-campbell/markdown/src/MarkdownServiceProvider.php on line 37