I found that a solution of mine was still referencing the Microsoft.Bcl.Build nuget project, and as I was using Visual Studio 2013, I figured it was no longer needed, so I removed it. After doing this, some of the projects refused to compile, reporting the error:
This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=317567.
After I remembered that this package modifies the project files a little, I fixed the broken projects by:
- Unloading them
- Editing them, removing the following lines:
<Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="…">
Text="…" HelpKeyword="BCLBUILD2001" />
Text="…" HelpKeyword="BCLBUILD2002" />
- Reloading them
Hope this helps someone else.