I think the reason is there is no 'bar' function in class Test but not sure as I don't have access to this compiler. However the error message you posted shows there is an attempt to use 'bar'.
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.