The most common cause of this error is that the dump file was FTP'ed to another server and it was not explicitly stated to transfer in BINARY mode. The first few bytes of the dump file are ASCII characters and FTP utilities may autosense this file to be an ASCII file. Yet the file is truly a binary file. So whenever FTP'ing a dump file, explicitly state to transfer in binary mode:
ftp myserver.acme.com
bin
put dump_file.dmp
(or use get depending on the server this was initiated from).
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