Fatal error: Uncaught Error: Class "Less_Tree" not found in /opt/lampp/htdocs/forum/flarum/vendor/wikimedia/less.php/lib/Less/Tree/Value.php:5 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/wikimedia/less.php/lib/Less/Tree/Value.php on line 5