Mobile non work

Good morning

I would like to know how to solve the problem, as the theme is not visible from mobile and the next error comes out

I already tried a blank and enable all scripts/styles , and I set php 7

Fatal error: Uncaught Error: Call to undefined function oceanwp_post_id() in /membri/provadecidilotu/wp-content/plugins/ocean-extra/includes/metabox/metabox.php:1893 Stack trace: #0 /membri/provadecidilotu/wp-includes/class-wp-hook.php(288): OceanWP_Post_Metabox->body_class(Array) #1 /membri/provadecidilotu/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array) #2 /membri/provadecidilotu/wp-includes/post-template.php(770): apply_filters('body_class', Array, Array) #3 /membri/provadecidilotu/wp-includes/post-template.php(557): get_body_class(Array) #4 /membri/.dummy/_av_share/master/wp_themes/mobile/foundation/header.php(12): body_class('ios dark-header...') #5 /membri/provadecidilotu/wp-includes/template.php(688): require_once('/membri/.dummy/...') #6 /membri/provadecidilotu/wp-includes/template.php(647): load_template('/membri/.dummy/...', true) #7 /membri/provadecidilotu/wp-includes/general-template.php(41): locate_template(Array, true) #8 /membri/.dummy/_av_share/master/wp_themes/mobile/magazine/index.php(1) in /membri/provadecidilotu/wp-content/plugins/ocean-extra/includes/metabox/metabox.php on line 1893

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