Enabling dependent NuGet Libraries download during build - Visual Studio

"Enable NuGet Package Restore" from within Visual Studio, all of those third-party references will be added. I forget whether you can just right-click on the solution name to do this, otherwise look in Options -> Package Manager -> "Allow NuGet to download missing packages during build".

Original Post
http://our.umbraco.org/forum/developers/extending-umbraco/44227-why-many-references-are-not-found-in-source-code

unable to read package from path nupkg - Post which saved me

This bug from the Chocolatey GitHub repo suggests that you need to clear the NuGet cache (%LocalAppData%\NuGet\Cache) and this should resolve itself.

Original Post is from
http://stackoverflow.com/questions/18661114/scriptcs-unable-to-read-package