PHP: <br />
<b>Fatal error</b>:  Uncaught Error: Class &quot;WP_Sitemaps_Provider&quot; not found in /www/habi.gna.ch/doc/wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php:17
Stack trace:
#0 {main}
  thrown in <b>/www/habi.gna.ch/doc/wp-includes/sitemaps/providers/class-wp-sitemaps-posts.php</b> on line <b>17</b><br />