AudioDatastore input output error

I am using audio files of unequal length,But for calculation of melSpectrograms i need equal datasamples in each file. I applied the transform function to make files equal. But then its not reading the transflrm files as desired. I am following https://in.mathworks.com/help/wavelet/examples/spoken-digit-recognition-with-wavelet-scattering-and-deep-learning.html example on my data. My code giving error

XTrain = helperspeechSpectrograms(scatds_Train,segmentDuration,frameDuration,hopDuration,numBands);

This scatds_Train is the transformed datastore, which is not readable by the support function there. I have attached this supporting file.

its giving me following error

"Unable to perform assignment because the size of the left side is 40-by-186 and the size of the right side is 40-by-187."

function X = helperspeechSpectrograms(ads,segmentDuration,frameDuration,hopDuration,numBands)
% This function is only for use in the 
% "Spoken Digit Recognition with Wavelet Scattering and Deep Learning"
% example. It may change or be removed in a future release.
%
% helperspeechSpectrograms(ads,segmentDuration,frameDuration,hopDuration,numBands)
% computes speech spectrograms for the files in the datastore ads.
% segmentDuration is the total duration of the speech clips (in seconds),
% frameDuration the duration of each spectrogram frame, hopDuration the
% time shift between each spectrogram frame, and numBands the number of
% frequency bands.
disp("Computing speech spectrograms...");

numHops = ceil((segmentDuration - frameDuration)/hopDuration);

numFiles = length(ads.UnderlyingDatastore.Files);
X = zeros([numBands,numHops,1,numFiles],'single');

for i = 1:numFiles
    
    [x,info] = read(ads);
%     x = normalizeAndResize(x);
    fs = info.SampleRate;
    frameLength = round(frameDuration*fs);
    hopLength = round(hopDuration*fs);
    
    spec = melSpectrogram(x,fs, ...
        'WindowLength',frameLength, ...
        'OverlapLength',frameLength - hopLength, ...
        'FFTLength',2048, ...
        'NumBands',numBands, ...
        'FrequencyRange',[50,4000]);
    
    
    X(:,:,1,i) = spec;
    
end
disp("...done");

end

%--------------------------------------------------------------------------

[jibrahim]

krishna,

Put a breakpoint where you assign spec to X(:,:,1,i), and then call read on your transform datastore. I think there is a mismatch in sizes on that line