I am trying to montage a MEG data file with spm_eeg_montage(BF), with 

BF = 

          D: [339x156000x1 meeg]

    montage: [1x1 struct]

BF.montage

ans = 

         tra: [9x270 double]

    labelnew: {1x9 cell}

    labelorg: {270x1 cell}

creating layout for ctf275 system

==>Index exceeds matrix dimensions.

Error in ft_prepare_layout>sens2lay (line 1020)

      mindist = mindist(1:round(numel(label)/4));

Error in ft_prepare_layout (line 421)

  layout = sens2lay(cfg.grad, cfg.rotate, cfg.projection, cfg.style, cfg.overlap);

Error in spm_eeg_project3D (line 28)

lay = ft_prepare_layout(cfg);

Error in spm_eeg_prep (line 104)

                [xy, label] = spm_eeg_project3D(sens, S.modality);

Error in spm_eeg_montage (line 454)

            Dnew = spm_eeg_prep(S1);

Error in editmontageforsources (line 36)

spm_eeg_montage(BF);

Error in DO_analysis (line 210)

            D{i} = editmontageforsources(S,BFfile,ccind);

I am not entirely sure why I get this error, can anyone help?

Thank you!

Regards

Tricia