I have got an error when using spectrogram; could you help me

I have got an error when using spectrogram; could you help me finding what is wrong? As it worked when I used it in another script for another question but it didn't work this time.

Error in spectrogram (line 168) pspectrogram({x},'spect',varargin{:});

Error in test5 (line 38) spectrogram(x,win,noverlap, FFT_LENGTH ,fs,'yaxis');