Do these files that it's trying to load exist? If not, the actual error happened earlier, when they were being generated. Looking at the entire trac-all.log instead of just the end might shed some light on this.

On Fri, 10 Aug 2012, Natalia Sánchez wrote:

Hi!I am running tracula for the first time and I am encountering the following error:

Loading brain mask of output subject from/Users/Natalia/Desktop/freesurfer/subjects/Justin/cJD/dlabel/mni/lowb_brain _mask.flt.nii.gz niiRead(): error opening file/Users/Natalia/Desktop/freesurfer/subjects/Justin/cJD/dlabel/mni/lowb_brain _mask.flt.nii.gz Loading FA map of output subject from/Users/Natalia/Desktop/freesurfer/subjects/Justin/cJD/dmri/mni/dtifit_FA.fl t.nii.gz niiRead(): error opening file/Users/Natalia/Desktop/freesurfer/subjects/Justin/cJD/dmri/mni/dtifit_FA.fl t.nii.gz Segmentation fault  Darwin dhcp-165-124-9-95.phystherapy.northwestern.edu 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386

trac-preproc exited with ERRORS at Fri Aug 10 16:19:17 CDT 2012

what file is lowb_brain_mask.flt.nii.gz? should this have been created during tracula or is this file my nodiff image?

Thanks!

-- Natalia Sánchez     PhD Candidate     Departments of Biomedical Engineering &     Physical Therapy and Human Movement Sciences    Northwestern University     645 North Michigan Ave, Suite 1100     Chicago, IL 60611