Please check that, all the string data have values or not. If some string value will be nil then you will get such error. So, include the condition for null value also.
As the error says, you are calling stringByAppendingString: on an NSXMLParser. Search your project for stringByAppendingString: and make sure you are calling it on a string.
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.