Can't Play The SIms 3 Late Night -_-

So I Bought The Sims 3 Starter Pack With The Sims 3, Late Night, And High End. I Downloaded Both Late Night And High End (I Already Downloaded The Sims 3 From The University Life) Now When I Try To Play Night (With The Disk In) It Keeps Saying Something About Putting The University Life Disk In. What The Hell Is Going ?? Why Can't I Play Late Night ?!?!?! -____- (Btw I Have A Acer Windows 8)