Microsoft.Build.AppxPackage.RemoveDuplicatePayload

The "Microsoft.Build.AppxPackage.RemoveDuplicatePayload" task could not be loaded from the assembly C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v12.0\AppxPackage\Microsoft.Build.AppxPackage.dll.  Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.App24