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Please try to update your system table and to see if it solves your problem. mysql_upgrade is stored in the "bin" folder under the MySQL server installation path.
To use mysql_upgrade, make sure that the server is running, and then invoke it like this:
shell> mysql_upgrade [options]
After running mysql_upgrade, stop the server and restart it so that it uses any changes that were made to the system tables.
For more information, please visit MySQL manual - http://dev.mysql.com/doc/refman/5.1/en/mysql-upgrade.html