relative permeability as a function of temperature and magnetic field in induction heating

I am doing induction heating simulation and i want to define relative permeability as function of temperature T and magnetic field H as mur(H,T). I have an expression which correlates the relative permeability as a function of temperature and magnetic field.
In my material, i first add magnetic field as model input which appears as variable {H1,H2,H3}. Temperature is already exist as variable T. Then i introduce Analytic function and define my expression and in Arguments as H,T and define upper and lower limits in parameters and give function name as mur. Then i go to the output properties and in the expression of relative permeability i write down mur(H,T). It appears as unknown variable H. And if i i compute the error appears as Fail to evaluate variable Jacobian. Variable H, Geometry 1, domain 2.

Kindly anyone please help me to introduce relative permeability as a function of magnetic field and temperature.

Thanks in advance.

Best regards
Adeel Ikram