I'm getting an error each time something requires the .net framework 4:
All the files are there but I have no idea why nothing is able to see the framework. NuGet is not working, Expression Studio is not working ... All the same error but sometimes different dll file.Unable to generate a temporary class (result=1).
error CS0009: Metadata file 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll' could not be opened -- 'Error importing module '' of assembly 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll' -- The system cannot find the path specified. '