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Beta: error CS0234: The type or namespace name 'TargetFrameworkAttribute' does not exist in the namespace 'System.Runtime.Versioning' (are you missing an assembly reference?)
I just downloaded and installed the beta. I opened my VS 2010 solution and added a new WSPBuilder project (no workflow). Then, I just did a build and I'm getting this error. Any idea what I'm doing wrong? Thanks.