重装后出现此问题，如何解决

Discuz! info: MySQL Query Error

Time: 2008-5-23 11:12am
Script: /register.php

SQL: INSERT INTO [Table]members (uid, username, password, secques, gender, adminid, groupid, regip, regdate, lastvisit, lastactivity, posts, credits, extcredits1, extcredits2, extcredits3, extcredits4, extcredits5, extcredits6, extcredits7, extcredits8, email, bday, sigstatus, tpp, ppp, styleid, dateformat, timeformat, pmsound, showemail, newsletter, invisible, timeoffset)
VALUES ('12', 'diddd', '9de679c1cca1052b5b03b7010e237891', '', '0', '0', '8', '221.216.104.250', '1211512350', '1211512350', '1211512350', '0', 20,20,20,0,0,0,0,0,0, 'fdfdf@china.com', '0000-00-00', '0', '0', '0', '', '0', '0', '1', '1', '1', '0', '9999')
Error: Duplicate entry '12' for key 1
Errno.: 1062

Similar error report has beed dispatched to administrator before.
到 [url]http://faq.comsenz.com 搜索此错误的解决方案[/url]

新增字段的数据表 (以下数据表中的字段可能是某些插件添加的，如您确认无误，可以忽略它们)
cdb_usergroups 新增的字段
    maxpmnum smallint(6) unsigned NOT NULL

但从未安装任何插件咯

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