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    java.lang.NullPointerException
        at com.openmarket.xcelerate.workflow.Participants.doesParticipantHaveRole(Participants.java:121)
        at com.openmarket.xcelerate.workflow.WorkflowEngine.defineNewAssignments(WorkflowEngine.java:2213)
        at com.openmarket.xcelerate.workflow.WorkflowEngine.defineNewAssignments(WorkflowEngine.java:2068)
        at com.openmarket.xcelerate.workflow.WorkflowEngine.takeTheStep(WorkflowEngine.java:5064)
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