freqstastics script

[Bonin, Claudia (NIH/NINDS) [F]]

I am trying to do statistics on time-frequency data across 16 subjects, averaging over channels. I received back the following error about 'neighbourselection' which means nothing to me.....Does anyone have any idea what might be wrong here? I have pasted in the exact message below.
thanks!
claudia 


>> cfg.statistic = 'kruskalwallis';
>> cfg.method = 'stats';
>> [s] = freqstatistics(cfg, fr, fr);
averaging over 3 channels
selected 50 time bins
selected 41 frequency bins
Warning: PACK can only be used from the MATLAB command line. 
> In fieldtrip/private/prepare_timefreq_data at 305
  In fieldtrip/private/statistics_wrapper at 167
  In freqstatistics at 44
??? Undefined function or method 'neighbourselection' for input arguments of type
'struct'.

Error in ==> statistics_wrapper at 181
    cfg = neighbourselection(cfg,varargin{1});

Error in ==> freqstatistics at 44
[stat] = statistics_wrapper(cfg, varargin{:});
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