Recently I created new Form called WorkersScreen. When I try to run the project I got this error:
Error 1 Two output file nam
In my case I had to to open the .csproj in Note++ and looked for .resx files in EmbeddedResource tags I found some strange .resx with strange language suffix example.aa.resx other files were normal files either with no language suffix or with *.ar suffix, I deleted the creepy embedded resource tag and that fixed the issue for me.
Make sure you don't have two .resx files. See in your project under YourServiceName.cs. Works for me.
I had the same issue, what I did was delete my migration files (via the studio), after I updated the database.