-6021 FFFFE87B   ERR INVALID FILE SEQUENCE

Source:  eDirectory

Explanation:  An incorrect file number has been detected while traversing a file set.

Possible Cause:  This error is reported when an incremental backup is being restored and the sequence number (or incremental backup number) does not match the expected number recorded in the database.

Action:  Locate the correct incremental backup and retry the operation.