Fail to simulate 2 physics together

Hello,

I am trying to simulate a model which has both solid mechanics and magnetic field modules. I can simulate two physics seperately, but every time they are connected, an error returns:

Segregated group 1
Failed to evaluate variable Jacobian.
- Variable: mod1.curlAz
- Geometry: 1
- Domain: 1

Here I attached a simple coupled model. Could anyone help me with it? Thanks