The software is complete new thing for me.
i am doing 1D modeling for the first time. any help would be really appreciated.
i am trying to make a driveline model.
i applied torque and inertia from modelica.rotational and then a Universal joint from multibody.
when i try to simulate it, it shows following error.

"[C:/OpenModelica1.9.2Nightly/lib/omlibrary/Modelica 3.2.1/Mechanics/MultiBody/Interfaces.mo:302:5-302:51:writable]  Warning: No corresponding 'inner' declaration found for component .Modelica.Mechanics.MultiBody.World universal1.world declared as 'outer '.

when i remove universal joint, it get simulate successfully.