I solved this issue by going to the project solution (whose build) was giving this error.
- right click on the project and unload the project.
- Then right click on the project and edit the .csproj file.
- Look for these temp (problematic) generated files. (see example code)
- remove this file references from the .csproj file.
- Right click on project and load back the project.
- Rebuild the solution.
- Its good to go now...
they look like this in the csproj file: