Add a .net reference in visual studio for mac that is missing

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I tried installing them with NuGet but I get this error for example when trying to install System.IO that also installs System.Runtime and : Could not install package 'System.Runtime 4.0.20'. The referenced component '' could not be found. The referenced component 'System.Runtime' could not be found. The referenced component 'System.IO' could not be found. Enable NuGet Package Restore to download them. This is the compilation error I get: This project references NuGet package(s) that are missing on this computer. There are 3 dependencies I can't add no matter what I try. I didn't write the application so I added all the missing dependencies using NuGet but I'm working with Visual Studio Community 2015 on a Visual Basic application targeting.