iOS 8 Today Extension not working on device
I found out that I was accessing my app group with the wrong suitename. Just make sure you access the app group with "group.something.something" not just "something.something"
Make sure extension target version
Please make sure your extension target version is correct. Xcode'd give you the highest version by default such as 8.3, and if your iOS version is lower than it, Xcode'd give your a crash.