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I am a new starter of COMSOL. I am facing this problem. Would you please suggest me what to do? Your help will be highly appreciated.....

Feature: Stationary Solver 1 (sol1/s1) Iteration for finding elasto-plastic strain variables did not converge. - Geometry: geom1 - Domain: 1 Failed to evaluate variable. - Variable: comp1.solid.Fiil33 - Defined as: comp1.solid.Fpi33 Failed to evaluate variable. - Variable: comp1.solid.Ji - Defined as: 1/(comp1.solid.Fiil33((comp1.solid.Fiil11comp1.solid.Fiil22)-(comp1.solid.Fiil12comp1.solid.Fiil21))) Failed to evaluate variable. - Variable: comp1.solid.Sl22 - Defined as: comp1.solid.Ji((comp1.solid.Fiil21(((((comp1.solid.D11comp1.solid.eel11)+(comp1.solid.D12comp1.solid.eel22))+(comp1.solid.D13comp1.solid.eel33))comp1.solid.Fiil21)+(comp1.solid.eel12(comp1.solid.D44(2comp1.solid.Fiil22)))))+(comp1.solid.Fiil22((comp1.solid.eel12(comp1.solid.D44(2comp1.solid.Fiil21)))+((((comp1.solid.eel11comp1.solid.D12)+(comp1.solid.eel22comp1.solid.D22))+(comp1.solid.eel33comp1.solid.D23))comp1.solid.Fiil22)))) Failed to evaluate expression. - Expression: d(((-comp1.solid.Sl11test(comp1.solid.el11)-2comp1.solid.Sl12test(comp1.solid.el12)-2comp1.solid.Sl13test(comp1.solid.el13)-comp1.solid.Sl22test(comp1.solid.el22)-2comp1.solid.Sl23test(comp1.solid.el23)-comp1.solid.Sl33test(comp1.solid.el33))comp1.solid.d)(dvol),{test@3}) Failed to evaluate Jacobian of expression. - Expression: ((-comp1.solid.Sl11test(comp1.solid.el11)-2comp1.solid.Sl12test(comp1.solid.el12)-2comp1.solid.Sl13test(comp1.solid.el13)-comp1.solid.Sl22test(comp1.solid.el22)-2comp1.solid.Sl23test(comp1.solid.el23)-comp1.solid.Sl33test(comp1.solid.el33))comp1.solid.d)(dvol)