Dear all, I'm trying to run a first level analysis. but I keep getting the following error: Failed 'Model estimation' Reference to non-existent field 'Vbeta'. In file "/ncf/apps/spm8.1/config/spm_run_fmri_est.m" (v2928), functio n"spm_run_fmri_est" at line 134. The following modules did not run: Failed: Model estimation any idea what's going on and how to solve this? Thanks very much in advance! D