Audio Compression with DCT method

I'm working on Audio Compression using DCT and I got this error

Array indices must be positive integers or logical values.

Error in cobadct (line 23)

frame=y([(framesize*(i-1)+1):framesize*i]);

How can I fix this error?

[Mohammad Azhar]

clc

clear

[y,Fs] =audioread('nokia.wav')

N=length(y);

[f0,idx] = pitch(y,Fs);

subplot(2,1,1)

plot(y)

ylabel('Amplitude')

xlabel('Sample Number')

x=[y];

n=round(length(x)/40);

p=zeros(n,40);

for k=0:39

p(:,k+1)=x(1+n*k:n*(k+1));

end

framesize=N/Fs;

M=round(y/framesize);

for...

i=(M)

if (i==M)

frame=y([(framesize*(i-1)+1):length(y)]);

else

frame=y([(framesize*(i-1)+1):framesize*i]);

end

end

X=dct(y,32768);

s=framesize*X;

b=length(s');

ratio=N/b;

A=idct(X,y);

[rows,columns]= size(A)

extra = rows*ceil(numel(A)/rows) - numel(A);

MU=reshape([X(:);nan(extra,1)],rows,columns)

for...

i=M

if (i==M)

frame1=MU([(framesize*(i-1)+1):length(MU)]);

else

frame1=MU([(framesize*(i-1)+1):framesize*i]);

end

end

[R,C]= size(y);

err = (((y-MU).^2)/(R*C)); % error in this line

MSE=sqrt(err)

subplot(2,1,2)

plot(MU)

ylabel('Amplitude')