CRM Online Managed Solution Import Failed Due to Error On Workflow With Output Variables

Hello,

The managed solution i'm trying to import has few UI customizations and a custom workflow. This is a custom workflow that performs a calculation and returns data to two output variables.  One is a decimal number and the other is a picklist value.  Easy enough.

My workflow process is setup to execute the custom workflow

then update the contact record with the data from the output variables

Here is the error when i import a manged solution that contains this workflow:

Constructor on type 'Microsoft.Xrm.Sdk.Workflow.Activities.ReferenceLiteral`1[[Microsoft.Xrm.Sdk.OptionSetValue, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]' not found.

I've tried removing the update part of the process but it was still complaining.  The only thing i can do is remove this workflow from my solution and register it manually using the Plugin Registration Tool.