Basically, this means that the server didn't recognize your request. Typically for an API, this means that the API couldn't decipher something, or it was missing an important feature. In this case, it determined that you included no source tag.
Typically, this is sent via an HTML form with the input type='file' tag. The way to emulate this is rather complex, but this question will point you in the right direction.
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.