Failed to evaluate Jacobian Expression in COMSOL plasma model
 

Undefined variable.
- Variable: Rion
- Global scope
Failed to evaluate Jacobian of expression.
- Expression: d(Rion*(comp1.plas.EpsilonE+comp1.plas.EpsilonI)*t est(comp1.En),{test@64})
Failed to evaluate Jacobian of expression.
- Expression: Rion*(comp1.plas.EpsilonE+comp1.plas.EpsilonI)*tes t(comp1.En)|


Can anyone help to solve this issue?