[Freesurfer] error in running fsfast tutorial

Hi,

I am trying to run the fsfast tutorial, and I am getting the following matlab error: Undefined function or method 'MRIwrite' for input arguments of type 'struct'.

I ran the following commands:

nexlin7:ythomas[test_fsfast/fsfast-tutorial/my-study] pwd /autofs/cluster/nexus/12/users/ythomas/data/test_fsfast/fsfast- tutorial/my-study nexlin7:ythomas[test_fsfast/fsfast-tutorial/my-study] preproc-sess -s mgh-101.1 -fwhm 6

I tried adding a startup.m file in /autofs/cluster/nexus/12/users/ ythomas/data/test_fsfast/fsfast-tutorial/my-study/startup.m before calling preproc-sess to tell matlab where to find MRIwrite, but that doesn't seem to help.

Thanks, Thomas