HTML elements have opening tags like <h1> and closing tags like </h1>.
Find the h1 element and change its text to: CatPhotoApp
You changed the h1 element into a CatPhotoApp element, but that isn’t a real element.
The challenge wants you to only change the words in between <h1> and </h1> (the part that says Hello World). You should not change or remove h1 at all.