Oracle Error Message
ORA-38712: Corrupt flashback log record header: block string, offset string.
Reason for the Error
A corrupt flashback database log record header was read. Either the record type or length were incorrect. More information was dumped to the trace file.
Solution
If 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.