Can not execute event observer 'block_xp\local\observer\observer::catch_all'

• line 164 of /lib/classes/event/manager.php: call to debugging()
• line 75 of /lib/classes/event/manager.php: call to core\event\manager::process_buffers()
• line 834 of /lib/classes/event/base.php: call to core\event\manager::dispatch()
• line 3688 of /course/lib.php: call to core\event\base->trigger()
• line 92 of /index.php: call to course_view()