Message Oracle ORA-38741 - Formatted blocks value string is not valid.

ERRORFormatted blocks value string is not valid.
CAUSEThe formatted blocks value in the flashback database log file was greater than the file size. The flashback database log file was corrupt.
ACTIONIf you are doing a FLASHBACK DATABASE, then the flashback cannot be performed because of the corrupted log. A restore and an incomplete recovery must be performed instead.