Lift and drag on a plate

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I am working on a problem with rotating aluminium plate beow a stationary halbach magnet array inside a cylindrical air domain. I am tryinf to calculate the lift and drag experienced by the plate, but i am getting the following error?

Undefined variable. - Variable: comp1.rmm.tAY - Geometry: geom1 - Boundaries: 8, 10-11, 181 Failed to evaluate Jacobian of expression. - Expression: comp1.rmm.tAY Failed to evaluate Jacobian of operator. - Operator: comp1.src2dst_ap3 - Geometry: geom1 - Boundaries: 312-317 Failed to evaluate Jacobian of expression. - Expression: ((comp1.spatial.invF11(comp1.rmm.tAX-comp1.src2dst_ap3(comp1.rmm.tAX)))+(comp1.spatial.invF12(comp1.rmm.tAY-comp1.src2dst_ap3(comp1.rmm.tAY))))+(comp1.spatial.invF13(comp1.rmm.tAZ-comp1.src2dst_ap3(comp1.rmm.tAZ))) Failed to evaluate Jacobian of expression. - Expression: if(comp1.incontact_ap3,comp1.spatial.invF11(comp1.rmm.tAX-comp1.src2dst_ap3(comp1.rmm.tAX))+comp1.spatial.invF12(comp1.rmm.tAY-comp1.src2dst_ap3(comp1.rmm.tAY))+comp1.spatial.invF13(comp1.rmm.tAZ-comp1.src2dst_ap3(comp1.rmm.tAZ)),0)



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