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
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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
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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.