iPhone & Mac Apps Crashing on Launch? Delete & Re-Download Them
If you updated or downloaded an app from the iOS or Mac App Stores recently and it crashes immediately on launch, you should delete the app and re-download it from the App Store to resolve the problem.
To delete an app iOS, just tap and hold on the icon until the “X” appears, clicking that to delete it. Similarly in OS X, from Launchpad you can click-and-hold on an icon and select the same “X” to delete the app. Reinstalling is just a matter of finding the app again on the appropriate App Store, assuming you already own the app you will not be charged to re-download it.
Apple notified AllThingsD that they “had a temporary issue that began yesterday with a server that generated DRM code for some apps being downloaded“, but the problem is now resolved assuming the user reinstalls the apps in question.