And then save settings (even if nothing changed), I get this :
Erreur de la base de données WordPress : [You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 5]
SELECT DISTINCT tt.taxonomy FROM IRCPT_wp_term_taxonomy tt JOIN IRCPT_wp_term_relationships tr ON tt.term_taxonomy_id = tr.term_taxonomy_id WHERE tr.object_id IN (82398) AND tt.taxonomy IN ()
Warning: Cannot modify header information - headers already sent by (output started at /home/coro3994/cpt.inter-reseaux.site/wp-includes/wp-db.php:1491) in /home/coro3994/cpt.inter-reseaux.site/wp-includes/pluggable.php on line 1281
Warning: Cannot modify header information - headers already sent by (output started at /home/coro3994/cpt.inter-reseaux.site/wp-includes/wp-db.php:1491) in /home/coro3994/cpt.inter-reseaux.site/wp-includes/pluggable.php on line 1284
If you create a new field group does the issue still remain ?
Also if you disable all the non toolset plugins and try to save this field group does the issue still remain ? I would like to ensure that this is not being caused by a plugin conflict.
The issue here is that your MySQL version is below the minimum requirements. Currently you have MySQL Version 5.5.5 however our plugins require at least version 5.6 in order to function correctly.
I would recommend that you contact your host in order for them to provide you with a newer version of MySQL on your server.
I'm not quite sure about this ; I'm using MariaDB 10.3.22
Also I use this very same server with another site with Toolset where I didn't see any of those problems.