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Problem while modelling an optical black hole

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Hello, I have a problem with this error. I don't know what to do.

Division by zero. - Function: / Failed to evaluate variable. - Variable: comp1.ewfd.kinp - Defined as: sqrt((comp1.ewfd.murScalar((comp1.ewfd.k0^2)comp1.ewfd.epsrScalar))(1+(comp1.ewfd.sigmaScalar/(comp1.ewfd.epsrScalar(comp1.ewfd.iomegaepsilon0_const))))) Failed to evaluate expression. - Expression: dvol_spatial(((jcomp1.ewfd.kinp)(-comp1.ewfd.tEtmpy))(1/comp1.ewfd.murScalar)) Failed to evaluate Jacobian of expression. - Expression: (jcomp1.ewfd.kinp(-comp1.ewfd.tEtmpxcomp1.ewfd.testDepvarx-comp1.ewfd.tEtmpycomp1.ewfd.testDepvary-comp1.ewfd.tEtmpzcomp1.ewfd.testDepvarz)/comp1.ewfd.murScalar)*(dvol_spatial)


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