January 2, 2015

KPM Restore Throws AggregateException

While I was migrating a legacy codebase from .NET 4.5 to vNext (.NET 5), I started getting this error when restoring my dependencies via kpm restore or building inside VS 2015.

System.AggregateException: One or more errors occurred. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Framework.PackageManager.Restore.NuGet.PackageFeed.<OpenNuspecStreamAsync>d__1.MoveNext()

Turns out there was a trailing space after one of my dependencies, e.g.

{
  "dependencies": {
    "Microsoft.AspNet.Mvc ": "4.0.0.0"
  }
}