sorry I mis read part of the message....
but the core error is still that two things are pointed at one file.
Error 1 two file output names have been resolved to the same output path: "obj\Release\EO.NewForm1.resources"
that file that has form resources is refered to by two forms or by two things the compiler is checking.
normally one Form in .net has one resource file.
possibly a form was copied and did not get a different resource file name?