I’m attempting to convert a dlabel file from the Human Connectome Project to a volumetric ROI that I can use for fiber tractography on other platforms. I followed the tutorial provided by HCP (hcp-users FAQ #9: How do I map data between FreeSurfer ... - HCP Wiki) for resampling HCP-derived data for use in FreeSurfer.

When I run the mri_label2vol command:

Does anyone have thoughts on how to troubleshoot this? I have not seen any similar errors described in the list.

1) FreeSurfer version: freesurfer-x86_64-apple-darwin16.4.0-dev-20170302

2) Platform: MacOS 10.12.3