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Error message

Warning: Cannot modify header information - headers already sent by (output started at /home/tilmanbe/domains/tilman.be/public_html/includes/common.inc:2777) in drupal_send_headers() (line 1486 of /home/tilmanbe/domains/tilman.be/public_html/includes/bootstrap.inc).
TypeError: Argument 1 passed to xmlsitemap_node_create_link() must be an instance of stdClass, boolean given, called in /home/tilmanbe/domains/tilman.be/public_html/sites/all/modules/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module on line 28 in xmlsitemap_node_create_link() (line 194 of /home/tilmanbe/domains/tilman.be/public_html/sites/all/modules/xmlsitemap/xmlsitemap_node/xmlsitemap_node.module).