Workflow Foundation Correlation Token error

Within a workflow that I was developing, there was a requirement to notify a group of SharePoint users that a lookup service had failed.  This particular activity was within a parallel activity sequence.  I chose to use the SendEmail activity to notify the users, but incorrectly set the Correlation Token to a new value.  When testing this functionality in the workflow I received an error:

SharePoint LOG
  1. WinWF Internal Error, terminating workflow Id#
  2. System.InvalidOperationException: Correlation value has not been initialized on declaration emailToken_JobNumberCreate for activity sendEmail_JobNumberNotCreated. at System.Workflow.Activities.CorrelationService.InvalidateCorrelationToken

The correct Correlation Token for a SendMail Activity is the “Workflow” token.  The reason, which is fairly obvious, is that the SendEmail activity maps to the workflow, not to a task, which would require a Task Token.

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