I can't open my songpop app on my iphone?

I can still play on facebook but everytime I try and open the app on my iphone the screen goes black for a second then returns to the homescreen. Does anyone know how to fix this?

It happens to me when I try to play Minecraft Pocket edition. I think the problem is that you might need to reboot your iphone or delete some things from your iphone and the restart your phone. If that doesn't work then I don't really know what the problem is.