Confused about the error

2018 10 15
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[y,Fs] = audioread('access_Denied.3gpp');
timeWindow = 20e-3; lengthWindow = round(timeWindow*Fs); % number of samples per window
% third argument specifies the number of overlapping samples yBuffer = buffer(x, lengthWindow, round(lengthWindow*0.2));
Error using buffer Input must be a vector.
Error in filter_1 (line 50) yBuffer = buffer(x, lengthWindow, round(lengthWindow*0.2));

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