Abstract_Indexable_Presenter not found

Found a work-around: added these requires to add the paths to the source:

require_once ABSPATH . “wp-content/plugins/wordpress-seo/src/presenters/abstract-presenter.php”;
require_once ABSPATH . “wp-content/plugins/wordpress-seo/src/presenters/abstract-indexable-presenter.php”;

Apparently the namespace is not recognised:
namespace Yoast\WP\SEO\Presenters;
Makes that sense ?

Hi Jeroen,
MyYoast is not a plugin but my latest implementation of Abstract_Indexable_Presenter as introduced in 14.0.
This is the (relevant part of the) code:
<?PHP
use Yoast\WP\SEO\Presenters\Abstract_Indexable_Presenter;

require_once ABSPATH . “wp-content/plugins/wordpress-seo/src/presenters/abstract-presenter.php”;
require_once ABSPATH . “wp-content/plugins/wordpress-seo/src/presenters/abstract-indexable-presenter.php”;

class My_Custom_Presenter extends Abstract_Indexable_Presenter {
public function present() {
// do the stuff here….
$meta=”<meta property=’og:image’ content='” . esc_attr($fileName) .
“‘/><meta property=’og:image:width’ content=’$w’/>”.
“<meta property=’og:image:height’ content=’$h’/>”;

return $meta;
}
/**
* Returns the value of our new tag.
*
* @return string The value of our meta tag.
*/
public function get() {
return ( $this->presentation->open_graph_locale === ‘nl_NL’ ) ? ‘Dutch’ : ‘Not dutch’;
}
}

All copied from your example implementation. Without the two lines on top “require_once….” I get the exception, apparently the path to the two php files is not found! In my development site this is not necessary, in my production it is!
May be a clue: in my development site I did not get a runtime error on this syntax in another module:

….. x=y
break;
The semi-colon after the y is forgotten. In my production I did get an error message. Maybe something similar is the case with your software. Language difference? php differences?

New version did not solve this problem!