Error: Two output filenames resolved to the same output path

All of a sudden my project stopped building and this error shows:
"Two output filenames resolved to the same output path."
I was just coding and no changes were made to the file/build structure. This is veeeeeery strange......

After a bit of googling I found that changing the build path should solve it, but it doesn't.

For the past hour I was trying to solve it with no progress... I am hoping someone had that error before and is able to help me with this one.

Thanks!

Hi! Probably your Form has 2 .resx (resources) files.

For Example

FrmMyForm.cs
FrmMyForm.Designer.cs
Form1.resx (try to delete it)
FrmMyForm.resx