because its an app that may or may not be compatible with your device or just may not be working at all because of a bad update ect. happens to me all the time make sure u let other people know on google play that this app does not work on the tablet you have so they do not make the same mistake and so the developers know they need to work on there app to make it more compatable with other devices.
Ouch. This will happen occasionally. Here are your options: Restart your device. Delete the app, then re-install it. If these DO NOT work, you are SOL. Write a review on the app in the app store and if enough people say something about the app crashing they will either remove it or fix the bug.