AssemblyAttributes.cs could not be found

I just added a web form to a new Visual Studio project.  When I try to run a Build in Visual Studio, an error says that the .NETFramework,Version=v4.0.AssemblyAttributes.cs cannot be found.  I verified that it exists though.  The error is as follows:

Source file 'C:\Users\xxxxx\AppData\Local\Temp\.NETFramework,Version=v4.0..NETFramework,Version=v4.0.AssemblyAttributes.cs' could not be found

I read this is this is likely a permissions issue, but it's not apparent what account requires full permission, to which folders, and how these permissions should be set.   When I look at the properties of each of the folders in the path above, it appears that I have full permission to all.  Should some other account be provided with full permissions?

Thanks.