Dear All, I am a new comer to SPM8. I am tring to use "spm_dcm_create" to generate some simulation data via user interface. But I always get the following error: >> spm_dcm_create Reference to non-existent field 'Ep'. Error in spm_dcm_generate (line 44) eigval = eig(DCM.Ep.A); Error in spm_dcm_create (line 302) spm_dcm_generate(['DCM_' syn_model '.mat'],source_model,SNR); I checked the generated variable DCM and it does not contain the reference field "Ep". Any suggestion would be much appreciated. Thank you. Regards, Chao