What's up guys, 

I am trying to consume the workflow DLL and im getting an error ' Value cannot be null.
Parameter name: key' at this step: 

    workflow.StartWorkflowDirectly(ruleName, Nothing, initiator, Creationoptions, parameters)

where parameters is of type IEnumerable(Of InstanceParameters). 

I added the code file for anybody out there who can help me resolve this issue.