Error: The file position must be a positive integer

Hello,

I am going through the SAR in human head example provided. Everything is completed as per the tutorial. I am trying to solve now.

However, I get this error:

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The file position must be a positive integer.
-Position:
Error in multiphysics compilation.
-Feature: Compile Equations: Frequency Domain (sol1/st1)
-Error: The file position must be a positive integer.
==================================

What does this error mean and how do I fix it?

Thanks.

Amro