Study error : NaN or Inf found when solving linear system using SOR.

Hello,

I am trying to calculate the electric field distribution on a nanocube when illuminated by a background electric field. I used 'Elecrtromagnetic Waves, Frequency Domain'. I used the scatteing field condition. However, when I run the study, I get the eroor:NaN or Inf found when solving linear system using SOR. Can anybody tell me what might be causing this?