Nectar_Arrow_Walker_Nav_Menu apparently extends the WordPress Walker class. This means that its methods’ arguments need to match the original class methods’ arguments:
public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {}
The WordPress class doesn’t have any optional parameters so it doesn’t have this issue. Make sure your method’s arguments match WordPress’ and don’t make any of them optional.
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