dnvm upgrade failing with exception

Question

I'm getting an unhelpful exception when running dnvm upgrade:

C:\Users\...\Visual Studio 2015\Projects\foo>dnvm upgrade
Determining latest version
Unable to find any runtime packages on the feed!
At C:\Users\banksd\.dnx\bin\dnvm.ps1:483 char:9
+         throw "Unable to find any runtime packages on the feed!"
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : OperationStopped: (Unable to find ...es on the feed!:String) [], RuntimeException
    + FullyQualifiedErrorId : Unable to find any runtime packages on the feed!

I also can't resolve "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final" in a fresh ASP.NET 5 project.

Don't know if the two are related.

Any advise?