Dear Geon-Ho, This is a bug in the current version of SPM12 (r6906). A fix is available here: https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=spm;2c0ae193.1611 Best regards, Guillaume. On 18/05/17 06:37, Geon-Ho Jahng wrote: > Dear All, > > During estimating the two sample t-test, I get the following error > message. Please let me know how to fix it. I have ASL CBF map from > normal (N=22) and patient (N=19) groups. All pre-processing steps were > performed using CAT12 and SPM12. > > I appreciate any comments. > Best > Geon-Ho > > ------------------------------------------------------------------------ > Running job #1 > ------------------------------------------------------------------------ > Running 'Model estimation' > > SPM12: spm_spm (v6678) 14:23:52 - 18/05/2017 > ======================================================================== > > SPM12: spm_est_non_sphericity (v6827) 14:23:52 - 18/05/2017 > ======================================================================== > Failed 'Model estimation' > Reference to non-existent field *'xVol*'. > In file "*D:\SPM\spm12\spm_est_non_sphericity.m" (v6827)*, function > "spm_est_non_sphericity" at line 105. > In file "D:\SPM\spm12\spm_spm.m" (v6678), function "spm_spm" at line 421. > In file "D:\SPM\spm12\config\spm_run_fmri_est.m" (v5809), function > "spm_run_fmri_est" at line 33. > > The following modules did not run: > Failed: Model estimation > > -- > Geon-Ho Jahng, Ph.D. > Professor of Radiology > Kyung Hee University Hospital at Gangdong > College of Medicine, Kyung-Hee University > 892, Dongnam-ro, Gangdong-gu, > Seoul 05278, South Korea > TEL: 82-2-440-6187 > FAX:82-2-440-6932 > Email: [log in to unmask] <mailto:[log in to unmask]> -- Guillaume Flandin, PhD Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square London WC1N 3BG