You can use this method to test the validity of our amp : https://search.google.com/test/amp?url=[your website]
when we try, a warning sign like this appears
This error occurs because there is a change in the Blogger HTML editing. As you know that currently Blogger is updating its features including an HTML editor.
The change that makes this error is the addition of code for the Adsense data-ad-client that uses the <! - and -> comments in the HTML source of the blog.
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html>
<HTML amp='amp' lang='id'>
<HTML amp='amp' b:css='false' b:js='false'>
</head><!--<head/>-->
<body>
</head>
<body>
<noscript><!--</body>--></noscript></body>
</HTML>
<!--<head/><!--<body/>--> </body>
</HTML>