.NET Upgrade: Interesting Workflow Activity Upgrade Issue

I ran into an interesting issue today upgrading a custom workflow activity.  I received this error:

<OrganizationServiceFault xmlns="http://schemas.microsoft.com/xrm/2011/Contracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <ErrorCode>-2147200995</ErrorCode>
  <ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
  <Message>Duplicate workflow activity group name: ”, activity name: ‘Assign email regarding to case’.</Message>
  <Timestamp>2013-06-14T19:45:24.1533902Z</Timestamp>
  <InnerFault>
    <ErrorCode>-2147200995</ErrorCode>
    <ErrorDetails xmlns:a="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
    <Message>Duplicate workflow activity group name: ”, activity name: ‘Assign email regarding to case’.</Message>
    <Timestamp>2013-06-14T19:45:24.1533902Z</Timestamp>
    <InnerFault i:nil="true" />
    <TraceText i:nil="true" />
  </InnerFault>
  <TraceText i:nil="true" />
</OrganizationServiceFault>

It turns out that the Plugin Registration tool didn’t like the fact that I did not have a WorkflowActivityGroupName specified, as you can see here:

image

I added one and the error went away.

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