Uncomment HTML what does type error argument not optinal mean

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<h1>Hello World</h1>

<h2>CatPhotoApp</h2>

<p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Edge/15.15063.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-html-and-html5/uncomment-html/

please, expand on your issue.
we can’t help if you don’t tell us what’s happening

This text will be blurredTell us what’s happening:

Your code so far


<!-- yo im a gamer
<h1>Hello World</h1>

<h2>CatPhotoApp</h2>

<p>Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
-->

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Edge/15.15063.

Link to the challenge:
https://learn.freecodecamp.org/responsive-web-design/basic-html-and-html5/uncomment-html

the challenge explain what a comment is, and it asks you to make the three elements visible again