Dear Vladimir, I'm trying to do group inversion analysis on my MEG data but it apparently doesn't work. I download the lastest version of spm8 and click on the button "group inversion" and, directly after clicking I got this error message : ??? Error: File: spm_eeg_inv_group.m Line: 197 Column: 9 "voltype" previously appeared to be used as a function or command, conflicting with its use here as the name of a variable. A possible cause of this error is that you forgot to initialize the variable, or you have initialized it implicitly using load or eval. Error in ==> spm_eeg_inv_imag_api>group_Callback at 480 spm_eeg_inv_group; Error in ==> spm_eeg_inv_imag_api at 53 feval(varargin{:}); % FEVAL switchyard ??? Error while evaluating uicontrol Callback Many thanks for your help, Best, Charline