ORA-39464
readable only by Data Pump Servers that support trailer block format
Cause
This is an informational message part of an export operation summary to indicate that the generated dump file set contains trailer blocks. Importing this dump file set requires a version of the Data Pump Server that supports trailer block format dump file sets.
Action
None required if this format is correct. Otherwise, re-run the export and specify a VERSION parameter value less than 23, to produce a header block format dump file set.