[1062] Duplicate entry '168 'for key' PRIMARY '- D

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Discuz! Database Error The database has encountered a problem. Need Help? Error messages: [Type] query error [1062] Duplicate entry '168 'for key' PRIMARY '[Query] INSERT INTO forum_post SET `fid` = '68 ', `tid` = '2373', `first` = '1 ', `author` =' WEST ', `authorid` = '2', `subject` = 'test', ` dateline `= '1292206228 ',` message `=' dfasdfsdfsadfsdfdsfsdf ',` useip `= '222 .220.89.176',` invisible `= '0 ',resin stone,` anonymous `= '0',garment accessories,` usesig `= '1 ',` htmlon `= '0 ',hot fix rhinestone,` bbcodeoff `=' -1 ',` smileyoff `=' -1 ',` parseurloff `='',` attachment `= '0',` tags `='',` pid ` = '168 '
Program messages: [Line: 0059] forum.php (require) [Line: 0397] source / module / forum / forum_post.php (require_once) [Line: 0403] source / include / post / post_newthread . php (insertpost) [Line: 2191] source / function / function_core.php (DB:: insert) [Line: 0782] source / class / class_core.php (DB:: query)


How to solve this problem ah. . . . An upgrade due to error?