Source:  FILESYS.NLM

Possible Cause:  The volume's extended directory space has been corrupted.

Action:  Run VREPAIR and restart the system.

Warning: If you delete the volume, all data will be destroyed. You will have to restore the data from a backup.

If the problem persists, make sure a volume backup exists. Delete the volume, re-create it, and restore the data from the backup.