Catastrophic Failure Error While Uninstalling Late Night?

Hi, I'm trying to uninstall Late Night so that I can install some other eps that I've forgotten about. However, as soon as the wizard starts, it gives me this error message. I've never had this problem before with installing or uninstalling Late Night, or with any other packs. I have uninstalled all the other packs just fine, even ones before Late Night. I've tried looking for other remedies, but they all seem to pertain to installing Late Night.

Are there any other ways to combat this problem?