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Oracle® Database 11g / 12c / 18c error codes IMP-00012: invalid export mode (character) in header
IMP-00012: invalid export mode (character) in header
Oracle Error Code: IMP-00012
Cause: The Export mode specified in the export file header is invalid.
Action: Check the export file to see if it was corrupted. If it was not, report this as an Import bug and submit the export file to customer support.