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Split complex variable in real and imaginary parts and iterative solver configuration

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Hi,

i'm tring to simulate an indutcor that produce some joule heating on a thin slab. This slab is a non linear material and has a HB curve. I work with 30kHz and i'm using a frequency solver with an iterative solver (GMRES). In order to increase the stability of the solver i activate the "split complex variable in real and imaginary parts" in the compile equation submenu. when i run my simulation i get the following error:

Undefined value found.
- Detail: NaN or Inf found when solving linear system using SOR.

I'm using a multigrid preconditioner.

Can someone help me.

Cheers
Nicola

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