Recently I was working on a small UWP app on my SurfaceBook and everything was fine. But when I pulled the code from GitHub down to my main machine I got the following error:
Your project.json doesn’t list ‘win10-x86’ as a targeted runtime. You should add ‘”win10-x86″: { }’ inside your “runtimes” section in your project.json, and then re-run NuGet restore.
After a while I figured out that this error is totally misleading, and the real problem is that your Nuget package source has been disabled. I have a feeling this was related to installing Visual Studio 15
preview.
Anyway, to fix it: Click Tools > Options > NuGet Package Manager > Package Sources, and then re-enable (or re-add) the sources.