Did the same for me and if you try to play again it says you've already won and to go to prize bank. If you read their wall it's filled with complaints about the same issue.
The problem is on their end so its not just you. All their wall posts earlier were full of the same complaint. Did it to me too and it might stay broke all weekend. Hope not though. The way it worked earlier, if it starts working later today I think you can go back and click again and be able to claim your prize. Maybe.
People are posting all over their wall - here's an email you can try: [email protected] ^^^HOWEVER^^^ Looks like sweepers blues strikes again!!! With nobody around to fix web pages on weekends/holidays I guess we'll have to wait until Monday to play this one!