Understanding Common Registration Errors
When registering, you may encounter registration errors that prevent you from enrolling in a course. The following list
includes common registration errors that students encounter while enrolling, including a description for each. To better
understand registration errors, a definition of *CRN#’s is included below.
*CRN-The Course Reference Number that is associated with a specific course (i.e. Psych 1A: CRN#11111, MW 8:00am-
9:00am, Staff, Building 26-1111, 16 wks). This number can be found next to the class day, time, professor, and location
information in the schedule of classes.
TIME CONFLICT:
The CRN you chose is at the same time as another class you registered for (no CRN can have time
overlap, not even by 1 minute!) You cannot add a class that begins at the same time another class ends.
Corequisite Course Requirement:
The CRN you chose requires a corequisite. A corequisite is a course that must be
taken at the same time, within the same semester. In some cases a corequisite may have been taken previously. For more
information visit the division office of the course you are attempting to enroll in.
Prerequisites/Test Score Error:
The CRN you chose requires another course to be taken prior to enrolling in the course.
You cannot register for this class without proving that you have already completed the prerequisite. You may need to take an
assessment test and/or turn in transcripts.
RESTRICTION:
The CRN you chose is restricted. Restricted courses are designed for a specific group of students. If you do
not belong to the program in which the CRN is designed you cannot add this class. If you are interested in participating in the
course, you may contact the program directly for program participation requirements.
LINKED:
The CRN you chose is linked. Linked courses are designed for a specific group of students. If you do not belong
to the program in which the CRN is designed you cannot add this class and/or take the additional course(s) linked to this
CRN. If you are interested in participating in the course, you may contact the program directly for program participation
requirements.
CLOSED:
The class is full. There are no longer any available seats for this course. See WAITLIST.
WAITLIST:
The CRN is available only for waitlist. This option allows you to be placed on a waitlist for the specific course and
be notified if a seat becomes available. If you choose to waitlist a course, be sure to check your Mt SAC email daily. You
may receive a notification with instructions on how to ADD the course if a seat becomes available before the class start date.
Waitlist email notifications have an expiration date.
SPECIAL APPROVAL:
The course is only available to students enrolled in a program (i.e. ASPIRE, Bridge, Teacher
Preparation Program, etc.) Review the class schedule online at
to learn what program offers this special
approval course and how to gain access. If you are interested in participating in the course, you may contact the program
directly for program participation requirements.
HOLDS:
There are several reasons why you may have a hold on your account including but not limited to, past due fees
and un-returned books to the college library. To view your holds go to your Student Portal, Student Tab #15. If your HOLD is
associated with a past due fee, pay fees by going to # 25 on the Student Tab or visit the Bursars office in Building 4. Once
fee HOLDS are paid, they clear overnight. If you do not clear a hold, you will be unable to register for classes and/or unable
to request official transcripts.”
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