i get an error. ,whats wrong in DWT? how LoD and HiD works in DWT ?

X=imread('camera man.png');

imagesc(X)

colormap gray

[LoD,HiD] = wfilters('haar','d');

[cA,cH,cV,cD] = dwt2(X,LoD,HiD);

subplot(2,2,1)

imagesc(cA)

colormap gray

title('Approximation')

subplot(2,2,2)

imagesc(cH)

colormap gray

title('Horizontal')

subplot(2,2,3)

imagesc(cV)

colormap gray

title('Vertical')

subplot(2,2,4)

imagesc(cD)

colormap gray

title('Diagonal')

S = idwt2(cA,cH,cV,cD,LoD,HiD);

K = mat2gray(S);