Mistake on UC application

So, I checked my application status today and decided to glimpse through my application. I noticed that I recorded taking a college class, Oral Communication I, on both fall and spring of 2015. How big of a mistake is this? Do I contact every university separately informing them of the mistake?

If you’re a transfer student, about five weeks after the filing period has ended, you are required to update your grades and course records.

If there are changes to your academic record…
Transfers: If you add or drop a course, fail to earn a C or better in a course or enroll in a new college after you submit your application, log back in and update your information online.