Error Submitting Batch For Workflow 2.0 Approval

Microsoft Dynamics GPWhile preparing earlier today for a client demo on Workflow 2.0, I encountered an error while trying to submit a batch for approval.

Workflow Error

[Microsoft][SQL Server Native Client 11.0][SQL Server][A .NET Framework error occurred during execution of user-defined routine or aggregate "Get "GetAssignedUsers".
System.IO.FileLoadException: Could not load file or assembly 'System.DirectoryServices, Vers[

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