hey, thanks Majeed, do you think it might be the source of my topic here ?
https://wordpress.org/support/topic/cant-add-a-child-to-a-familly/
If you look in wp-config.php for the line $table_prefix = ‘something’, it will tell you what the table prefix is for your site. If its the default ‘wp_’, then no, my suggestion won’t make any difference to you.
If your table prefix is something else, then it may make a difference but the code is too complex for me to say. You’ll need to wait for the plugin author to issue an update.
If you are feeling lucky, replace wp_ in line 68 with your table prefix, deactivate and reactivate treepress to run the change. Take a backup first.