Linked AMP version is invalid

180 pages showing AMP errors – I guess there is a clash with a plugin but I have no idea which one – above is just the one I looked at first.
Not a techie!! Analytics does say those pages will not appear in search results
I have looked at the other similar queries but they all seem to have different issues.

Error A mandatory AMP HTML tag is missing from this document.

Not Started
180
Error Crawl issue
N/A
0
Error Custom JavaScript is not allowed.
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Not Started
180
Error Only amp-boilerplate and amp-custom ‘style’ tags are allowed, and only in the document head.
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Not Started
180
Error Referenced AMP URL is not an AMP
N/A
0
Error Tag found outside the document head which is only allowed as a direct child of the document head.
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Not Started
180
Error Tag or text which is only allowed inside the body section found outside of the body section.
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Not Started
180
Error The tag ‘BODY’ appears more than once in the document.
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Not Started
178
Error The tag ‘head > style[amp-boilerplate]’ is missing or incorrect, but required by ‘noscript > style[amp-boilerplate]’.

The page I need help with: [log in to see the link]