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My_pc$ mri_surf2vol --o 0021_thickness-in-volume.nii.gz --subject 0021 \ --so $SUBJECTS_DIR/0021/surf/lh.white $SUBJECTS_DIR/0021/surf/lh.thickness \ --so $SUBJECTS_DIR/0021/surf/rh.white $SUBJECTS_DIR/0021/surf/rh.thickness

ERROR: Option  --so unknown

Why it returns that —so is unknown? Exactly this line is given as an example on: https://surfer.nmr.mgh.harvard.edu/fswiki/mri_surf2vol#ArgumentsforBothMethods

Thanks,
Boirs