[Eeglablist] Problem with Plotting Channel Spectra and Map

[Donia ZaheriSarabi]

Hi,
I'm trying to plot the channel spectra and map for my 4 channels EEG raw
data, but when I use the "Channel Spectra and Map" in EEGLAB, I get this
figure with empty spaces for the map (figure below). May I ask if anyone
knows what is the problem?

Link to the image: http://tinypic.com/r/wi7hb4/8

P.S: I have signal processing toolbox install on my MATLAB

Thanks,
Donia
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