It's similar, but not exactly the same. The error I got was closer to the one shown in https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=fsl;38d3e56.1510 The problem was with my bvecs/bvals file. If I remember correctly I had nan's in my bvecs that were a result of normalizing the vectors for eddy; although, if you only have one shell this probably doesn't apply to you. It may be worth double checking your bvecs/bval files? Forrest On Tue, May 29, 2018 at 9:14 PM, Sabina Rautu <[log in to unmask]> wrote: > Hi Forrest, > > Thank you for the reply! > The output I get is: > > Reading images > Performing volume-to-volume registration > Running Register > Loading prediction maker > Evaluating prediction maker model > I'm thrown > terminate called after throwing an instance of 'EDDY::KMatrixException' > what(): > Aborted (core dumped) > > Is it similar to what you had? > > Best, > Sabina >