Very simple cantilever pull-in voltage problem

Hi,

Im having a problem trying to simulate the pull-in behavior of a cantilever. Essentially, Im following the biased_resonator_2d_model but instead of VdcSP I'm using E_est, a variable for Young modulus. The model doesnt work and the error message Im getting is:
"There are 1 void equations (empty rows in matrix) for the variable comp1.E_est. at coordinates: (0,0), ... and similarly for the degrees of freedom (empty columns in matrix). Returned solution is not converged."
Im setting the initial value to 1000e9. I'm feeling Im missing something obvious. Any help appreciated.

Best,
Sotiris