Dear Freesurfers experts, 

I'm a beginner in the diffusion imaging preprocessing. I was following the freesurfer/dti tutorial with my own data when i get stuck in the trac-all step. I have created the configuration files trying to follow the tutorial instructions and when I tried to run the trac-all command I get the following error:

pcpb3846:4220 lab1-rmn$ trac-all -prep -c $TUTORIAL_DATA/outputs/dmrirc.tutorial

set: Variable name must contain alphanumeric characters.

ERROR: must specify either one number of control points

ERROR: or as many numbers as pathways