@pako69 WPPSO is a plugin, I tried deactivating it and it solves the problem.
One error is: MANDATORY_AMP_TAG_MISSING_OR_INCORRECT
and the other: The attribute ‘prefix’ may not appear in tag ‘html ? for top-level html’.
<!doctype html>
<html amp lang="en-US" prefix="og: https://ogp.me/ns# fb: https://ogp.me/ns/fb# article: https://ogp.me/ns/article#">
<head>
This is the link to a page with both error (I have 38 total)
And in this page I have an error caused by a video, but not sure how to fix it:
Invalid URL protocol ‘http:’ for attribute ‘src’ in tag ‘amp-video > source’.
<amp-video class="wp-video-shortcode amp-wp-enforced-sizes" width="640" height="360" controls="" sizes="(min-width: 640px) 640px, 100vw"><source type="video/webm" src="https://edgesuite.craftsy.com/4266/00/00-low.webm?_=1"/></amp-video>