I updated my website (https://hetnatuurhuis.nl) Joomla 3.7.0 and upgraded the PHP version to 7.1.4. At first it looks like JAMP is still working, but when you validate the AMP-pages you get 11 errors. Sometime the AMP-page is blank, wich happens random it seems. Can you advice?

Kind Regards,
Jos Frenken

AMP Validator
Errors: 11
Warnings: 0
Line
Column
Issue
1
0
The mandatory tag 'html doctype' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'html ⚡ for top-level html' is missing or incorrect. Debug. Learn more.
1
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The mandatory tag 'head' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'link rel=canonical' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'meta charset=utf-8' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'meta name=viewport' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'body' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'amphtml engine v0.js script' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'noscript enclosure for boilerplate' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'head > style[amp-boilerplate]' is missing or incorrect. Debug. Learn more.
1
0
The mandatory tag 'noscript > style[amp-boilerplate]' is missing or incorrect. Debug. Learn more.

Looks like an issue in the Joomla 3.7 page cache plugin.
Keep it unpublished and everything will work normally.

We will investigate deeper with the Joomla team.

Kind regards,
John

Hello John,

Unpublishing the page-cache plugin solved the problem. Thank you!

Kind Regards,
Jos Frenken