Hi All -
Thanks to everyone who pitched in here. This error is finally fixed. I contacted the freesurfer guys who were very helpful, but ultimately it was a problem in which my SIPS was not disabled (I thought it was).
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osxdaily.com]
This was a problem because Freesurfer needed libraries in the usr directory, which is blocked (even for sudo) by SIPS. Even though I had sourced Freesurfer appropriately in the terminal, the source language needs to be in each custom script in order to establish library location accurately.
I hope this helps anyone else having this error!
Cheers,
Steffie