[Freesurfer] Learning dti processing tutorial

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Dear freesurfer experts: I am trying to learn dti processing. For using Tracula it appears there is a need for running "recon-all -all -i -s” on every subject before starting to run Tracula. But there seems to be a problem. I have a Parkinson dwi images database and every subject gives me an error of the type “input(s) cannot have multiple frames!”. I am a little bit stuck on this step. Is it a problem of the file as input? Am I putting the wrong file? Can it be done a recon-all analysis to a dwi image? With trackvis I can obtain the results without any problem. My doubt comes from FreeSurfer only and may be my little knowledge about it. Thanks for your help! Sincerely, Andrade.