Fatal error: Uncaught Error: Interface "core\hook\described_hook" not found in /home/u6178854/public_html/test2/course/classes/hook/before_activitychooserbutton_exported.php:31 Stack trace: #0 {main} thrown in /home/u6178854/public_html/test2/course/classes/hook/before_activitychooserbutton_exported.php on line 31