Simnibs FEM mesh error

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Dear community:

I have been trying to run sample raw dataset from https://neuroimage.usc.edu/brainstorm/DatasetMedianNerveCtf dataset with FEM mesh segmentation.

I am using SIMNIBS version 4.0.1 in Windows 10 because in mac os it is only tested in Catalina not sonoma and I tried in Sonoma and it doesn't work. So my issue is this:

C:\Users\andra\SimNIBS-4.0\simnibs_env\lib\site-packages\simnibs\segmentation\samseg\GMM.py:84: RuntimeWarning: invalid value encountered in true_divide

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numpy.linalg.LinAlgError: Matrix is not positive definite

status =

1

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SimNIBS call: charm --forceqform —forcerun Subject 01 path/to/subject_T1.nii

SimNIBS error #1: See command window

I contacted SImNIBS support team. They tried in SimNIBS and everything is ok from their side. They suggested something might be off with MGZ to nii.gz conversion. They also suggested this https://github.com/simnibs/simnibs/discussions/182.

I hope there is any quick fix.

Thank you for all the help in advance.

Rene Andrade.

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I would really appreciate any answer, please. I have seen this Brainstorm not recognising path or command to SimNIBS 4.0.0 - #7 by Francois.

I assume no quick fix for the moment. Just use charm in windows command prompt and then import the folder to brainstorm.

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@tmedani, could you give a look to this issue?

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