Back office Menu section warnings

Hi,

in wordpress back office in Appearance > Menu warning messages appear.

I have already tested that by activating another theme (Storefront) the problem is not there, and I also already contacted WPML people since the errors are on that plugin.

They told me that it is probably a conflict of the theme used.

These are warning messages:

Warning: Undefined array key 0 in /home/boisit/public_html/stage/wp-content/plugins/sitepress-multilingual-cms/inc/wp-nav-menus/class-wpml-nav-menu.php on line 566

Warning: Undefined array key 0 in /home/boisit/public_html/stage/wp-content/plugins/sitepress-multilingual-cms/inc/wp-nav-menus/class-wpml-nav-menu.php on line 566

Warning: Cannot modify header information - headers already sent by (output started at /home/boisit/public_html/stage/wp-content/plugins/sitepress-multilingual-cms/inc/wp-nav-menus/class-wpml-nav-menu.php:566) in /home/boisit/public_html/stage/wp-admin/includes/misc.php on line 1431

Warning: Cannot modify header information - headers already sent by (output started at /home/boisit/public_html/stage/wp-content/plugins/sitepress-multilingual-cms/inc/wp-nav-menus/class-wpml-nav-menu.php:566) in /home/boisit/public_html/stage/wp-includes/functions.php on line 6896

Warning: Cannot modify header information - headers already sent by (output started at /home/boisit/public_html/stage/wp-content/plugins/sitepress-multilingual-cms/inc/wp-nav-menus/class-wpml-nav-menu.php:566) in /home/boisit/public_html/stage/wp-admin/admin-header.php on line 9

Thank you

Maurizio

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