我正在尝试从Oracle 12c数据库导出架构。我是从命令提示符执行此操作，需要在我的桌面上安装文件（转储和日志）。
我写的命令如下
C:\Users\Suhas.S\Desktop>expdp username/password@TNS schemas=idbprod directory=dumpdir \ dumpfile=idbprod.dmp \ logfile
=expdp_idbprod.log version=11.2
Export: Release 12.1.0.2.0 - Production on Thu Aug 17 13:12:12 2017
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 12c Standard Edition Release 12.1.0.2.0 - 64bit Production
ORA-39002: invalid operation
ORA-39070: Unable to open the log file.
ORA-39087: directory name DUMPDIR is invalid
有人可以帮助我吗