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Hi there,
Hope this finds you well

I have noticed the following error for some of my runs:


@# Cortical ribbon mask Mon Dec 14 15:43:24 PST 2020
/Applications/freesurfer/7.1.1/subjects/BT_long/BT_055_base/mri
\n mris_volmask --aseg_name aseg.presurf --label_left_white 2 --label_left_ribbon 3 --label_right_white 41 --label_right_ribbon 42 --save_ribbon --parallel BT_055_base \n
SUBJECTS_DIR is /Applications/freesurfer/7.1.1/subjects/BT_long
loading input data...
Running hemis in parallel
Processing left hemi
Processing right hemi
computing distance to right white surface 
computing distance to left white surface 
error: MatrixMultiply: m1 is null!
Darwin PHTH-CDM-NBOASORT 18.5.0 Darwin Kernel Version 18.5.0: Mon Mar 11 20:40:32 PDT 2019; root:xnu-4903.251.3~3/RELEASE_X86_64 x86_64

recon-all -s BT_055_base exited with ERRORS at Mon Dec 14 15:43:27 PST 2020


Here are details of the computer and FS version I am using:


It seems to happen at random, whenever I run recon-all on the same subject again, the error doesn’t occur. This is true for cross-sectional, base, and long processing steps in my machine. I have seen an email relating to this issue before, but I wasn’t able to access the attachment file which would fix the problem.

I was wondering if you guys would be able to help?


Thank you
Nárlon Cássio

Nárlon Cássio Boa Sorte Silva, PhD
CIHR/MSFHR Postdoctoral Research Fellow
Aging, Mobility, and Cognitive Neuroscience Lab
Djavad Mowafaghian Centre for Brain Health
University of British Columbia
Twitter: @BoaNarlon