Hello @mehrdadm
Thank you for contacting us, it seems you are using a AMP in Reader Mode with Legacy Theme/
You may be using a plugin that provides features such as HTML minification or HTML optimizations, that might remove the type="” attribute from <script> tag making it an invalid tag.
Currently you have
<script async="" src="https://cdn.ampproject.org/v0.mjs" crossorigin="anonymous"></script>
it should be
<script type="module" async="" src="https://cdn.ampproject.org/v0.mjs" crossorigin="anonymous"></script>
Please note it’s missing type="module" creating AMP validation issue.
We recommend turning off the HTML minification or HTML Optimization feature from other plugins.
We hope the suggestion is helpful!
Thank you so much.
There was a problem with WP Fastest cache premium plugin turning on extra HTML minification.
I disabled it and fixed my problem.
Glad our suggestion is helpful, I’ll mark this as resolved Open a new support topic if you face further issues, also feel free to leave a plugin review, we would love to hear your feedback.