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Dear SPMers, Could any of you advise what the following error means? Failed 'Model estimation' Output argument "V" (and maybe others) not assigned during call to "C:\Program Files\spm8\spm_reml.m (spm_reml)". In file "C:\Program Files\spm8\spm_spm.m" (v2975), function "spm_spm" at line 869. In file "C:\Program Files\spm8\config\spm_run_fmri_est.m" (v2928), function "spm_run_fmri_est" at line 69. Pictorially, I noticed that the motion parameters in the model were a uniform shade of grey rather than their usual finely striped appearance. The error continually happens when it's trying to calculate the 128th ReML iteration. Sincerely yours Rachel *********************************************** Dr Rachel Mitchell, Lecturer in Psychology, Durham University Honorary Senior Research Fellow, Institute of Psychiatry, KCL Governor, Tees Esk & Wear Valleys NHS Foundation Trust Correspondence: Dept. of Psychology,Durham University,Science Site,South Road,Durham. DH1 3LE. UK Tel: +44 (0)191 334 3272 Fax: +44 (0)191 334 3241