One or more packages could not be completely uninstalled

Question

I have an ASP.NET MVC 4 application. I used NuGet to update all of the NuGet packages that were installed when I created the application. One of the packages was Microsoft.B

Answer 1

In my case, the relevant package folders remained in ~\packages, although they were empty. I deleted the folders and restarted Visual Studio, and this warning went away.