Error on pages after installation

Hi,

Have installed and enabled plugin, but if i go to any of my sites pages there now is some visual error in the page CMS so i cant edit the page any more.

Also i get this error in the “show AMP for current page”

Fatal error: Call to undefined function is_post_type_viewable() in /storage/content/16/101716/xn--balkongmbler-cjb.se/public_html/wp-content/plugins/accelerated-mobile-pages/templates/features.php on line 6328

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