This can be due to a few reasons:1. The hack is for an older version of the app and it does not support the latest version. Always check the topic to see if the version in the title is the same as the latest App Store app version. Another reason could be that you have another hack installed which is conflicting with the new one. Check your installed packages in Cydia.2. The hack may be causing the crash due to x features. This is usually not the case since most hacks are tested before release but try disabling some features. Test each feature one by one. Also CrashReporter from Cydia will help immensely to troubleshoot your app crashes. To disable features in iGMenu, please read the iGMenu & iGAuth FAQ.3. Corrupted and broken app. To fix this simply try re-downloading your app from the App Store.