Name

I apologize I forgot to say that I wrote these code on theme’s functions.php

add_action( 'init', function () { 
	register_post_type( 'news', [ 
		'label' => 'Latest News!',
		'public' => true,
		'menu_position'=>30,
		'supports' => array('title', 'editor', 'thumbnail' ), 		
		'show_in_rest'=>true,
		'has_archive' =>true, 
	]);
});

Thank you very much for your answer. After modifying class.xmlsf-sitemap.php, Fatal errors disappeared. Fixed??
I am looking forward to being next version released.????