I keep getting the following error when I try to active in VS2015Pro, How do I fix this?

System.FormatException: One of the identified items was in an invalid format.
at Xamarin.Components.Ide.Activation.ActivationService.GetErrorWorkflow(LicenseSyncResult[] results, Boolean ignoreSyncErrors)
at Xamarin.Components.Ide.Activation.ActivationService.d__100.MoveNext()
at Xamarin.Components.Ide.Activation.ActivationDialog.DisplayWorkflowStep(ActivationWorkflowStep step)
at Xamarin.Components.Ide.Activation.ActivationDialog.<>c__DisplayClass11.b__12(Task t)

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