Fatal error: Uncaught Error: Class "Drupal\media_library\Form\AddFormBase" not found in /home/qcsvlel/www/core/modules/media_library/src/Form/FileUploadForm.php:33 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/media_library/src/Form/FileUploadForm.php on line 33