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Hi Dear All,

I am working on EEG data. I want to do "re referencing". For this I use following code:

S = [];
S.D = D; % D contains data
S.refchan = 'average';
D = spm_eeg_reref_eeg(S);  

But I face the error "", 

Error using subsref
Reference to non-existent field 'fid'.

Error in meeg/subsref (line 122)
                varargout{1} = builtin('subsref', feval(subs(1).subs, this),  subs(2:end));

Error in spm_eeg_montage (line 422)
        if ~isempty(Dnew.indchantype('EEG')) && (isempty(Dnew.sensors('EEG')) ||...

Error in spm_eeg_reref_eeg (line 98)
D = spm_eeg_montage(S1);

Error in preprocess (line 153)
    D = spm_eeg_reref_eeg(S);


Is it related to fiducials? I have fiducials file in mat format separately. could you please help me how I can import fiducials information?

P.S. Using command "D = spm_eeg_convert(S);" I receive a warning telling: Could not obtain fiducials automatically.   

Best regards;
Dandil