Terminating app due to uncaught exception 'NSInvalidArgumentException?

Set a breakpoint on objc_exception_throw, then build the app for debug, run the app with breakpoints on and cause the crash again, then go up the stack to the relevant code.

Crash is not for this code ..somewhere you are using.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.