can anyone help me in this type of error while modelling phase chnage problem: Undefined variable. - Variable: comp1.u - Geometry: geom1 - Domain: 2 Failed to evaluate variable. - Variable: comp1.nitf1.ur - Defined as: comp1.u Failed to evaluate variable. - Variable: comp1.ht.phc1.minput_velocityr - Defined as: comp1.nitf1.ur Failed to evaluate variable. - Variable: comp1.ht.ur - Defined as: comp1.ht.phc1.minput_velocityr Failed to evaluate expression. - Expression: dvol_spatial(r(pi(comp1.ht.d((((-2)comp1.ht.rho)comp1.ht.Cp)((comp1.Trcomp1.ht.ur)+(comp1.Tzcomp1.ht.uz)))))) Failed to evaluate Jacobian of expression. - Expression: (-2comp1.ht.rhocomp1.ht.Cp(comp1.ht.urcomp1.Tr+comp1.ht.uzcomp1.Tz)test(comp1.T)comp1.ht.dpir)*(dvol_spatial)
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