I am creating a model of a two wheeler with a hub motor on the rear wheel. I wanted to include a simple powertrain system so I imported the linear torque map powertrain from the two wheeler model in the assembly wizard. I have not made any changes except add a force at the rear wheel center, on the wheel body.
I have specified the following expression under the Tz rotational properties of the force: `{sv_torque_output.VARVAL}`, the torque_output is a solver variable prespecified in the imported system.
I am running a straight line acceleration event with transient analysis with Motionsolve, with the Altair driver added.
I am getting the following error:

Can someone please help me solve this problem?
I have checked my model and there is nothing with the ID of 31800100, if that helps.