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Try to go into your phpmyadmin, choose the mybb_users-table, click at "Operations" and than "Repair Table" at the bottom of the page, this should repair your table, tho i dont know if this will help ya ^^

Yeah try repairing it... what plugins did you have??

It is still damage

Same error message as before??

Contact your host to repair it

Repairing database tables (without phpMyAdmin)

Or

How To Quickie: Repair MySQL Tables

Or

As Ryan says...

Oh, yeah
It's now work good
thank you
I repaird again from phpmyadmin

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oh, now
I wanted to upgrade but during the upgrading I have this error:

Fatal error: [SQL] [1054] Unknown column 'oldadditionalgroups' in 'mybb_banned'
ALTER TABLE mybb_banned CHANGE oldadditionalgroups oldadditionalgroups TEXT NOT NULL in /home/salehfor/public_html/inc/db_mysql.php on line 544