JoomSEF Error

Error: JoomSEF Error

Could not save the SEF URL to database: Duplicate entry '100530' for key 'PRIMARY' SQL=INSERT INTO `jos_sefurls` (`sefurl`, `origurl`, `priority`, `Itemid`, `trace`, `sm_indexed`, `sm_date`, `sm_frequency`, `sm_priority`,`locked`,`host`) VALUES ('events/cat-listevents/2014/07/25', 'index.php?option=com_jevents&day=25&month=07&task=cat.listevents&year=2014', '90', '211', NULL, '0', '2014-07-25', 'weekly', '0.5',0,'')