Deprecated: html_entity_decode(): Passing null to parameter #1 ($string) of type string is deprecated in /usr/www/users/mymitfgdwf/wp-content/plugins/ultimate-faqs/includes/template-functions.php on line 354

You may have already placed a main base unit in the module configuration diagram.
Scroll up or down in the module configuration diagram and check if a main base unit has been placed in it.
When it has already been placed, you can place a new main base unit after deleting the existing main base unit.