Как исправить эти ошибки

posthash	Check	Error: Incorrect file format 'posthash'
posthash	Check	Error: Corrupt
posthash	 	 тут пустое поле

DROP TABLE IF EXISTS posthash;
CREATE TABLE `posthash` (
  `userid` int(10) unsigned NOT NULL default '0',
  `threadid` int(10) unsigned NOT NULL default '0',
  `postid` int(10) unsigned NOT NULL default '0',
  `dupehash` char(32) NOT NULL default '',
  `dateline` int(10) unsigned NOT NULL default '0',
  KEY `userid` (`userid`,`dupehash`),
  KEY `dateline` (`dateline`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

INSERT INTO posthash VALUES('14', '1', '0', '6dfa05c2d133f2c1a963e4406e66dc28', '1275396310');
INSERT INTO posthash VALUES('48', '19', '0', '9d1117ec518ce1524a0175fe3c6f8f40', '1275396002');
INSERT INTO posthash VALUES('48', '62', '0', '12a9cfec628d4f7d5a3d7ef8348d62d2', '1275395852');