Message d'erreur

• Warning : Cannot modify header information - headers already sent by (output started at /var/www/vhosts/drupal.xyz/drupal_core/includes/common.inc:2861) dans drupal_send_headers() (ligne 1551 dans /var/www/vhosts/drupal.xyz/drupal_core/includes/bootstrap.inc).
• TypeError : Argument 1 passed to xmlsitemap_node_create_link() must be an instance of stdClass, bool given, called in /var/www/vhosts/drupal.xyz/stephane-chaudesaigues.fr/httpdocs/sites/all/modules/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module on line 28 dans xmlsitemap_node_create_link() (ligne 194 dans /var/www/vhosts/drupal.xyz/stephane-chaudesaigues.fr/httpdocs/sites/all/modules/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module).