Please help.

I acciedently deleted maps apps from the phone while using iFunBox. I only deleted the Maps app folder under the application directory. I download a stock Maps app from this site and copied it back to same directory but now I can't get Maps to open. When I try to open it, it just blinks and goes back to springboard screen.

Anyone with 3.1.2, can you email me the Maps app folder. I'm thinking that the download version is for 3.1.1 or lower. If this is not the case, can anyone tell me how to get it back. Thanks a lot.