Updating sticker app to work w/iOS 11

Hello, I am trying to update all of my sticker apps for compatibility w/iOS 11. I can't get it to work for some reason. I am using XCode 9. I know the sticker apps don't work because they disappeared from my phone & I am unable to get them to load back on to it for testing/running. I have even gone so far as to create a brand new project for 1 of my sticker apps to see if that would do it & it still won't work w/iOS 11. It starts to work w/my phone like it used to but then it stops & goes back to my main screen. The last line to appear on XCode is: terminating with uncaught exception of type NSException. Any help or suggestions on how to get my current apps to work w/iOS 11 would be greatly appreciated!!! Thank you!!!