Sims 3 University Life technical issue...?

So my problem is simply this... I enroll my sims to go to university and my sims don't actually go... it loads the whole pick a household create a household screen and I have tried everything I can think of to fix it. I have deleted my cache files and TravelerDB.pkg file. no luck switched my .backup to .sims3 for that game and it didn't work. and I troubleshoot it and find out that the expac works when I start a new game or with a previously played game but it doesn't work at all for any household in this particular game I'm playing. I have no mods and turned off my cc and that didn't work. This family is however set to the highest life span and I do use cheat codes. Oh and I tried saving the sims I wanted to take to college in my library and loaded them in university world and that was just bad....

Anyway I'm at my wits end I really want to fix this and honestly I'm not really good with computers so any suggestions you all might have is welcome but I need very specific step by step instructions.... Honestly I don't even know how to use mods....

Thank you ^.^