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Implicit equation solving involving spatial and time dependent variables.

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Hi!

I am trying to solve implicit equation involving spatial and time dependent variables. For ex:
iloc=exp(phi1-phi2-iloc*R),
phi1 and phi2 are potentials which are space and time dependent.

If i define this in the variable section it is showing "Circular variable dependency".
I even tried using an intermediate variable but still the error persists( As suggested in another thread)

I am using 1-D geometry, I want to evaluate this value at every point of the domain and send it to a different component for further processing.

Please help me out!
I have tried domain ODE's but they are of less help, the new error is "Undefined value found in the stiffness matrix".

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