public function prepare_item_for_response( $item, $request ) {
		$data = array();

		$fields = $this->get_fields_for_response( $request );

		if ( rest_is_field_included( 'id', $fields ) ) {
			$data['id'] = (int) $item->ID;
		}

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$links = $this->prepare_links( $item );
			$response->add_links( $links );
		}

		return $response;
	}

	/**
	 * Prepares the links for the request.
	 *
	 * @since 6.3.0
	 *
	 * @param WP_Post $post the Navigation Menu post object.
	 * @return array Links for the given request.
	 */
	private function prepare_links( $post ) {
		return array(
			'self' => array(
				'href'       => rest_url( rest_get_route_for_post( $post->ID ) ),
				'embeddable' => true,
			),
		);
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Failed opening required '/home/radioaztecadihit/public_html/wp-includes/rest-api/endpoints/class-wp-rest-font-families-controller.php' (include_path='.:') in /home/radioaztecadihit/public_html/wp-settings.php:355
Stack trace:
#0 /home/radioaztecadihit/public_html/wp-config.php(104): require_once()
#1 /home/radioaztecadihit/public_html/wp-load.php(50): require_once('/home/radioazte...')
#2 /home/radioaztecadihit/public_html/wp-blog-header.php(13): require_once('/home/radioazte...')
#3 /home/radioaztecadihit/public_html/index.php(17): require('/home/radioazte...')
#4 {main}
  thrown in <b>/home/radioaztecadihit/public_html/wp-settings.php</b> on line <b>355</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/radioaztecadihit/public_html/wp-includes/l10n.php:857
Stack trace:
#0 /home/radioaztecadihit/public_html/wp-includes/l10n.php(960): load_textdomain('default', '/home/radioazte...', 'es_ES')
#1 /home/radioaztecadihit/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/radioaztecadihit/public_html/wp-includes/l10n.php</b> on line <b>857</b><br />