Simulation error in time dependent study

Hi

I'm closely following the built-in tutorial model "coil above plate", so I'm using the magnetic field (mf) physics with the single-turn coil domain and so on. The only difference is that I'm not working in 2D asymetric but in 3D.

The problem is that I have an error message "Failed to find initial solution. Singular matrix. For mesh case 0 there are degrees of freedom that do not occur in any equation (empty columns in matrix) for the variable mod1.mf.VCoil. Last time step is not converged" when simultaing in transient domain.

Since I've done almost the same steps of the coil above plate but in 3D, I'm stuck in this awkward situation and it's really important for me to overcome it.

So I'll be extremely grateful for any help, please.

Thanks for your help