sims 3 there was an error during startup please see the log for more details

I just got the new expansion pack, seasons, downloaded it, and when i went to go play it, it said at the start up screen " there was an error during startup please see the log for more details" i uninstalled every game and tried to start from the beginning again with the first sims and i'm still getting the same error. THIS IS ABSOLUTE CRAP. can someone help me?!?! i've tried all i can try.