Warnings on Portfolio page: call_user_func_array() expects parameter 1 to be…

Hello,
after some theme and pluging update, I’m getting these 4 warnings on all portfolio pages.
Could be related to Virtue or Kadence Toolkit?
Thank you
Evridigit

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘SitePress’ does not have a method ‘get_adjacent_post_join’ in <path_to_wordpress_root>/wp-includes/class-wp-hook.php on line 300

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘SitePress’ does not have a method ‘get_adjacent_post_where’ in <path_to_wordpress_root>/wp-includes/class-wp-hook.php on line 300

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘SitePress’ does not have a method ‘get_adjacent_post_join’ in <path_to_wordpress_root>/wp-includes/class-wp-hook.php on line 300

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘SitePress’ does not have a method ‘get_adjacent_post_where’ in <path_to_wordpress_root>/wp-includes/class-wp-hook.php on line 300

I tried to clean the cache, re-save a previous portfolio page and also to create a new portfolio page, but I always get the same warnings

I’m using WordPress 4.8.1 hosted by SiteGround.com
These are the installed plugins (all updated to the current last version)
Duplicator – 1.2.16
Elementor – 1.6.3
EU Cookie Law – 2.10
Kadence Toolkit – 4.5
WPML Media – 2.2.0
WPML Multilingual CMS – 3.7.1
WPML Page Builders – 1.1.3
WPML Sticky Links – 1.4.1
WPML String Translation – 2.5.4
WPML Translation Management – 2.3.1
Yoast SEO – 5.1