I try to active relevanssi prenium and i have this message:
Warning: Constant RELEVANSSI_PREMIUM already defined in /var/www/vhosts/prodemo.com/httpdocs/wp-content/plugins/relevanssi-premium/relevanssi.php on line 92
Fatal error: Cannot redeclare relevanssi_current_user_can_access_options() (previously declared in /var/www/vhosts/prodemo.com/httpdocs/wp-content/plugins/relevanssi/lib/admin-ajax.php:35) in /var/www/vhosts/prodemo.com/httpdocs/wp-content/plugins/relevanssi-premium/lib/admin-ajax.php on line 29
Warning: search_by_sku(): Argument #2 ($wp_query) must be passed by reference, value given in /var/www/vhosts/prodemo.com/httpdocs/wp-includes/class-wp-hook.php on line 310
Thanks for your help