[FieldTrip] Problems plotting TFR map

[ingenieur eniso]

I am using fieldtrip-20130101 and Matlab 7.10.I have a problem when I
try to plot TFR map.
The error message I receive is:
??? Error using ==> griddata at 53

X and Y must be same length as Z or the lengths
of X and Y must match the size of Z.

Error in ==> topoplot at 463
 [Xi,Yi,Zi] = griddata(x', y, data, xi', yi, cfg.interpolation); %
Interpolate the  topographic data
Error in ==> lecture at 65
[handle]=topoplot(cfg, meanfft)
meanfft is a vector containing the average of the spectral power of
each electrode.

I have all the electrode locations loaded and the same command works
on the same system using version fieldtrip-20130101.

Thanks for your help,
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