When a course is approved through the course request/arppvoal system:
Coding error detected, it must be fixed by a programmer: Could not load preference message_provider_course_courserequestapproved_loggedin. Does the component and name you supplied to message_send() match a row in message_providers? Message providers must appear in the database so users can configure how they will be notified when they receive messages.
More information about this error
Debug info: blah
line 126 of /lib/messagelib.php: coding_exception thrown
line 4087 of /course/lib.php: call to message_send()
line 4038 of /course/lib.php: call to course_request->notify()
line 51 of /course/pending.php: call to course_request->approve()