Could you please attach your bpmn file. Which camunda version do you use?
Maybe there is some problem with the scopes. Also it would be helpful if you attach the server log file.
Still the whole picture is a little bit unclear to me. As far as I understand Debug.bpmn is your main process and the error occurs in the sub process “Lease Creation and Negotiation” when you try to complete some task. You have the same parameters in “Permit Requests” where everything is fine. Could you please attach those two sub processes.
Permits and Lease subprocesses use the exact same methods to use SubGroup