I am getting 4 different errors for 2 of my pages

There is another page with similar errors and rest of the pages are fine.
The errors are following-
– The extension ‘amp-facebook-like’ was found on this page, but is unused. Please remove this extension.
– CSS syntax error in tag ‘style amp-custom’ – end of stylesheet encountered in prelude of a qualified rule.
– The text inside tag ‘style amp-custom’ contains ‘html comments’, which is disallowed.
– The mandatory tag ‘body’ is missing or incorrect.

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