Why won't my App Store app on my Jailbroken iPhone 3Gs open?

The app opens to a white screen for 1 milisecond, then closes before I can even see anything. I have had my phone jailbroken way before this problem occurred. It just randomly did this. All my other apps work. I have tried syncing and unsyncing my apps (but as we all know, the app store is not an app that is synced or unsynced, it comes pre-installed on the phone)....HELP please!!

Can I like reinstall the app somehow or just fix it?!?! Any help would be great.
 
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