$params, '', '&' );
		}

		return home_url( $basename );
	}

	/**
	 * Returns the list of supported object subtypes exposed by the provider.
	 *
	 * @since 5.5.0
	 *
	 * @return array List of object subtypes objects keyed by their name.
	 */
	public function get_object_subtypes() {
		return array();
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_Sitemaps_Provider' not found in /home/payon/public_html/wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php:17
Stack trace:
#0 /home/payon/public_html/wp-settings.php(311): require()
#1 /home/payon/public_html/wp-config.php(92): require_once('/home/payon/pub...')
#2 /home/payon/public_html/wp-load.php(50): require_once('/home/payon/pub...')
#3 /home/payon/public_html/wp-blog-header.php(13): require_once('/home/payon/pub...')
#4 /home/payon/public_html/index.php(17): require('/home/payon/pub...')
#5 {main}
  thrown in <b>/home/payon/public_html/wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php</b> on line <b>17</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/payon/public_html/wp-includes/l10n.php:786
Stack trace:
#0 /home/payon/public_html/wp-includes/l10n.php(874): load_textdomain('default', '/home/payon/pub...', 'fa_IR')
#1 /home/payon/public_html/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/payon/public_html/wp-includes/l10n.php</b> on line <b>786</b><br />