You may not be able to register for a class due to one or more of the following:
Prerequisites have not been met for the class. Some classes require a minimum test score, a previously completed class, preparatory course work, program admission or instructor permission.
You can review prerequisites by class here.
Co-requisite class or lab was not added (e.g. GEO 1010 and GEO 1015 must be added together).
A registration hold has been placed on your account. You might have a hold due to an outstanding balance, academic standing, missing directory information, etc.