Message Oracle ORA-29340 - export file appears to be corrupted: [string] [string] [string]

ERRORexport file appears to be corrupted: [string] [string] [string]
CAUSEThis is caused either by a corrupted export file or by an Oracle internal error.
ACTIONMake sure the export file used for transportable tablespace is not corrupted. If the error still occurs, call Oracle support.