The tag img may only appear as a descendant of tag noscript. Did you mean amp-img

Validation Error:

The tag 'img' may only appear as a descendant of tag 'noscript'. Did you mean 'amp-img'?

The above error is clearly due to your AMP web-page code having a image tag which is starting with <img and not <amp-img. It is mandatory to change all img tags to amp-img or else your HTML code would not pass the validation and you would see this error!

1. Find the following string in your source code: <img and </img>
2. If you get any results, replace them with <amp-img and </amp-img>,also make sure to add default width and height attribute as its needed as well.
3. Save and validate your amp code again it should work!

<amp-img
  alt="This is an AMP Image!"
  title="Some title goes here!"
  src="/images/chicago.jpg"
  width="400"
  height="300"
  layout="responsive">
</amp-img>