Problem running Asp.Net Core Application under 1.0.1

Since I upgraded to Asp.Net Core 1.0.1, I am having problems running my web application in VS2015 (and at the command prompt).  When I 'dotnet run', I get the following:

D:\Scheduler+Plus Web Apps\SP_Reports\src\SP_Reports>dotnet build
Project SP_Common_Classes (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.
Project SP_Reports (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.

D:\Scheduler+Plus Web Apps\SP_Reports\src\SP_Reports>dotnet run
Project SP_Common_Classes (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.
Project SP_Reports (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.
The specified framework 'Microsoft.AspNetCore.Mvc', version '1.0.1' was not found.
  - Check application dependencies and target a framework version installed at:
      C:\Program Files\dotnet\shared\Microsoft.AspNetCore.Mvc
  - Alternatively, install the framework version '1.0.1'.

I checked nuget manager (and project.json) and Microsoft.AspNetCore.Mvc 1.0.1 is installed for all projects in this solution. 

Suggestions as to what to check next? 

Thanks!

Mark Lindahl