Not generating descriptions with %excerpt%

Hello!
My issue is
Not generating descriptions with %excerpt%
I tried these ways
——–
/*
* A simple function to control the number of Twenty Seventeen Theme Front Page Sections
* Source: wpcolt.com
*/
function wpc_custom_front_sections( $num_sections )
{
return 20; //Change this number to change the number of the sections.
}
add_filter( ‘twentyseventeen_front_page_sections’, ‘wpc_custom_front_sections’ );

add_filter( ‘rank_math/frontend/description’, function( $description ) {
if ( is_singular( ‘listings’ ) ) {
//global $post;
$value = RankMathHelper::get_settings( ‘titles.pt_listings_description’ );
return ” !== $value ? RankMathHelper::replace_vars( $value, [] ) : ”;

}

return $description;
});

——–
/**
* Allow changing the meta description sentence from within the theme. 20200626 133736
*
* @param string $description The description sentence.
*/
add_filter( ‘rank_math/frontend/description’, function( $description ) {
return $description;
});

add_action( ‘rank_math/frontend/description’, function( $description ) {

if ( ! is_singular() ) {
return $description;
}

global $post;
$desc = RankMathPost::get_meta( ‘description’, $post->ID );

if ( $desc ) {
return $desc;
}

if ( empty( $post ) || empty( $post->post_content ) ) {
return $description;
}

$keywords = RankMathPost::get_meta( ‘focus_keyword’, $post->ID );
$post_content = RankMathPaperPaper::should_apply_shortcode() ? do_shortcode( $post->post_content ) : $post->post_content;
$post_content = preg_replace( ‘/<!–[sS]*?–>/iu’, ”, $post_content );
$post_content = wpautop( $post_content );
$post_content = wp_kses( $post_content, [ ‘p’ => [] ] );

// 4. Paragraph with the focus keyword.
if ( ! empty( $keywords ) ) {
$regex = ‘/<p>(.*’ . str_replace( [ ‘,’, ‘ ‘, ‘/’ ], [ ‘|’, ‘.’, ‘/’ ], $keywords ) . ‘.*)</p>/iu’;
preg_match_all( $regex, $post_content, $matches );
if ( isset( $matches[1], $matches[1][0] ) ) {
return $matches[1][0];
}
}

// 5. The First paragraph of the content.
preg_match_all( ‘/<p>(.*)</p>/iu’, $post_content, $matches );
return isset( $matches[1], $matches[1][0] ) ? wp_html_excerpt( $matches[1][0], 160 ) : ”;
});

/*
* Code to check the meta description that is set on the Rank Math
* Titles & Meta > Factoring listing description and return it
* for single listings
*/
add_filter( ‘rank_math/frontend/description’, function( $description ) {
if ( is_singular( ‘listings’ ) ) {
//global $post;
$value = RankMathHelper::get_settings( ‘titles.pt_listings_description’ );
return ” !== $value ? RankMathHelper::replace_vars( $value, [] ) : ”;

}

return $description;
});
——–

https://rankmath.com/kb/filters-hooks-api-developer/#change-meta-description

——-
Can you help me?

Thank you!