Two output file names resolved to the same output

Question

Recently I created new Form called WorkersScreen. When I try to run the project I got this error:

Error 1 Two output file nam

Answer 1

I confirm WimOmbelets answer given in the comments. This can apparently happen when you rename a class in VS2012 (I never had this in a prior version).

I can't be sure this is the cause, but one thing I did different from my normal way is I used F2 to rename it as opposed to changing it and then pressing control-.