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