PHP: <br />
<b>Fatal error</b>:  Uncaught Error: Class &quot;WP_Customize_Setting&quot; not found in /www/habi.gna.ch/doc/wp-includes/customize/class-wp-customize-nav-menu-setting.php:21
Stack trace:
#0 {main}
  thrown in <b>/www/habi.gna.ch/doc/wp-includes/customize/class-wp-customize-nav-menu-setting.php</b> on line <b>21</b><br />