Discuz! Database Error

(3) Error writing file 'G:\mysqltemp\MYF8AD.tmp' (Errcode: 28)
SELECT * FROM it618_union_reguser ORDER BY it618_time desc LIMIT 0,15

PHP Debug

No.FileLineCode
1plugin.php47include(%s)
2source/plugin/it618_union/index.inc.php61discuz_database::query(%s)
3source/class/discuz/discuz_database.php142db_driver_mysqli->query(%s, false, false)
4source/class/db/db_driver_mysqli.php148db_driver_mysqli->halt(%s, %d, %s)
5source/class/db/db_driver_mysqli.php223break()
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