'Add two images in MATLAB w/o resizing image

Running this code gives me an error that I cannot fix. How can I solve this without resizing the original image and still add that 2 images?

    a = imread('sample1.jpg'); 
    b = imread('sample2.jpg');
    
    c = imadd(a, b);
    imshow(c);

I'm getting the following error enter image description here

matlab

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