Lastest plugin update cause site down with 500

Hi, my site down after perform an plugin update to latest version

i found the error_log file with following info:

[01-Mar-2017 09:55:55 UTC] PHP Fatal error: Call to undefined method WPML_WP_API::is_comments_post_page() in /home/MyUserName/public_html/wp-content/plugins/woocommerce-multilingual/inc/wcml-switch-lang-request.php on line 136

and yes, many repeated line

how can i fix it?

Thanks