Fatal error: Uncaught Error: Class 'Pion\Laravel\ChunkUpload\Handler\AbstractHandler' not found in /opt/lampp/htdocs/us/vendor/pion/laravel-chunk-upload/src/Handler/ContentRangeUploadHandler.php:22 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/pion/laravel-chunk-upload/src/Handler/ContentRangeUploadHandler.php on line 22