how to add a label to so Navigation search form?

Hi all,

i saw here a thread about how to label the search form correctly for accessibility. The code which were given works correctly as solution so i tried the same on my site. But now i have the problem, that the web accessibility tool (wave.webaim.org) tells me, that a form control has more than one label associated with it. The notice before was that a form has a title but no label associating with

My site: https://design-netzwerk.eu/

Thanks in advance for your tipps,

Stephan

The code which were given:

add_filter( 'generate_navigation_search_output', function() {
printf(
'<form method="get" class="search-form navigation-search" action="%1$s">
<label for="nav-search">Search:</label>
<input type="search" class="search-field" id="nav-search" value="%2$s" name="s" title="%3$s" />
<input type="hidden" name="post_type" value="product" />
</form>',
esc_url( home_url( '/' ) ),
esc_attr( get_search_query() ),
esc_attr_x( 'Search', 'label', 'generatepress' )
);
} );