When submitting a new open problem there happened a server error:

Warning: Duplicate entry '3017-0' for key 1 query: INSERT INTO node_data_field_related (field_related_nid, vid, nid, delta) VALUES (0, 3017, 1849, 0) in /Users/dm/Sites/dm.irmacs.sfu.ca/html/includes/database.mysql.inc on line 121

Warning: Cannot modify header information - headers already sent by (output started at /Users/dm/Sites/dm.irmacs.sfu.ca/html/includes/database.mysql.inc:121) in /Users/dm/Sites/dm.irmacs.sfu.ca/html/includes/common.inc on line 269