OCI-39411
header checksum error in dump file "string"
Cause
The header block for the Oracle Data Pump dump file contained a header checksum that did not match the value calculated from the header block as read from disk. This indicated that the header was tampered with or otherwise corrupted due to transmission or media failure.
Action
Make sure the filesystem where the dump files are stored does not report any issues and has enough capacity. Re-create the Data Pump export and retry the import. If the problem persists, contact Oracle Support Services.