ORA-31670: Username argument must be specified and non-null.
Cause: Called change user with a NULL username or a null string.
Action: Specify a valid username argument. If this error occurs from a Data Pump client (e.g. expdp or impdp), try the operation again. If the error occurs again, contact Oracle Customer Support and report the error.
ORA-31671
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ORA-31670Username argument must be specified and non-null.