Compute displacement

Hi,
I am a amateur at COMSOL and have to create a model using PVDF attached to an aluminium sheet which rotates and bends on encountering an abnormality.
So my problem is that i first created a rotating shaft using MBD and was able to get its displacement computation in the solution. I should mention that this shaft was a single block only.

Now that i have started modelling the whole system, as a new file, when i create the module using MBD, Electrostatics and Solid mechanics, when i try to compute the solution, i just have stress and Electric potentials as variables to compute the output even though i had selected to compute MBD in my study.

Please advice.

Thanks