I had the same problem. It is because of your rootviewcontroller not being set. Set the main page or the first page where your first navigation bar would be originating as rootviewcontroller.
From there self. Navcontroller pushviewcontroller....
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.