[Freesurfer] TRACULA

Hi list, I'm trying to run a test subject with TRACULA. I placed a folder in /Applications/freesurfer/subject/subject_prova which contains these files: data.nii.gz (DWI), bvals and bvecs (as used in previous FSL analysis) and T1-images.in /Applications/freesurfer/subject/subject_prova This is the command that I'm running:[iMac-di-Stefano:~] Stefano% trac-all -prep $FREESURFER_HOME/subjects/subject_prova/CON_01 --i $FREESURFER_HOME/subjects/subject_prova ERROR: flag /Applications/freesurfer/subjects/subject_prova/CON_01unrecognized-prep /Applications/freesurfer/subjects/subject_prova/CON_01 --i /Applications/freesurfer/subjects/subject_prova Please, give me an help.

Thanks in advance,

Stefano