"cannot call this function from a non-master process"
*Cause: Called a Data Pump process model function from a process which is
not a master process.
*Action: Create a master process first. Then call the function from the
master process. 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.