why i cant get the second figure ? how can i fix it

clear all; close all;

I = imread('64img.png','png');

I = double(I);

figure;imshow (abs(I));

title ('test')

PH=rand([64,64]);

I = I .* exp(2i*pi*PH);

FTS = fftshift (ifft2 (fftshift (I)));

A = abs (FTS);

figure; imshow (mat2gray (A));

title ('objective spectrum')

here i can get the first figure but after that got an error why i cant get the objective spectrum? Couldnt fix it :(

[Chunru]

What is error message? Where it goes wrong?

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Chunru]

I = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1114385/image.bmp');
I = double(I);
figure;imshow (abs(I));
title ('test')

%PH=rand([64,64]);
PH = rand(size(I));   % make PH the same size as I
I = I .* exp(2i*pi*PH);
FTS = fftshift (ifft2 (fftshift (I)));
A = abs (FTS);
figure; imshow (mat2gray (A));
title ('objective spectrum')