This is quite strange - could you upload the image for us to test please, and tell us what command line you used? Please upload the files in a single compressed tarfile to http://www.fmrib.ox.ac.uk/cgi-bin/upload.cgi And then email me the upload ID. Cheers. On 8 Sep 2010, at 07:11, William Sohn wrote: > Dear FSL community, > > Hi I just updated my version of FSL and all of a sudden I am getting an error when doing BET. The error message is RMS_DEVIATION ERROR:: Could not invert matrix. > > I was wondering how I could fix this problem. I've run the same data through an older version of FSL and it works fine. > > Thank you, > > -William Sohn > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------