UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support upgrade from 6.5 to 6.5.1

Hi all, I have another sort of issue:

Adding Index on B_Approved field... FAILED
SQL Query: ALTER TABLE w3t_Posts ADD INDEX approved_ndx (B_Approved)
Reason for failure: Error writing file '/home/virtual/site217/fst/var/lib/mysql/inpiega_com_-_UBBT/#sql-1994_292.MYI' (Errcode: 122)
Upgrade Step: http://SITENAME/UBBTFOLDER/install/upgrade.php?step=altertable