Hello, I'm conducting a longitudinal analysis and encounter an error when running the "long_mris_slopes" command (this is contained in the online tutorial: http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/LongitudinalTutorial).

The error that arises within a minute is "ERROR -10 : mris_calc compute sym. pct. change (spc) problem?", any thoughts? Thanks all.