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Not sure how you setup/installed ants in your home directory, but it could be the install permissions are wrong on antsRegistrationSyNQuick.sh.  You could try making that script executable with, $ chmod 755 /home/vbarletta/ants-2.5.4/bin/antsRegistrationSyNQuick.sh - R.

On Dec 4, 2024, at 16:48, Barletta, Valeria <VBARLETTA@mgh.harvard.edu> wrote:Dear Freesurfers,Do you know how to fix this error in trac-all? (I'm using Ubuntu 18.04) #@# Inter-subject registration Wed Dec  4 22:37:52 CET 2024/home/vbarletta/ants-2.5.4/bin/antsRegistrationSyNQuick.sh -d 3 -m trac/R01121_SCAN/dmri/dtifit_FA.nii.gz -f /home/vbarletta/tester/freesurfer/trctrain/hcp/MGH35_HCP_FA_template.nii.gz -o trac/R01121_SCAN/dmri/xfms/diff2syn/home/vbarletta/ants-2.5.4/bin/antsRegistrationSyNQuick.sh: Permission denied. trac-preproc exited with ERRORS at Wed Dec  4 22:37:52 CET 2024 Alternatively, is there a way to run Tracula without using ants? Thank you for your help,Valeria _______________________________________________Freesurfer mailing listFreesurfer@nmr.mgh.harvard.eduhttps://mail..nmr.mgh.harvard.edu/mailman/listinfo/freesurfer