There is no engine with name `ExstingCloud`

Hi all

I followed [1] to use rally with existing cloud, but I got an issue as follow:

(rally)dev@dev-K42JE:~$ rally --debug deployment create --filename=existing.json --name=existing
2014-05-04 11:15:52.397 3307 DEBUG rally.cmd.cliutils [-] INFO logs from urllib3 and requests module are hide. run /opt/rally/local/lib/python2.7/site-packages/rally/cmd/cliutils.py:116
2014-05-04 11:15:53.069 3307 ERROR rally.deploy.engine [-] Deployment b3047058-a619-4315-ad1a-f5b55dd2277b: Deploy engine for ExstingCloud does not exist.
Command failed, please check log for more info
2014-05-04 11:15:53.754 3307 CRITICAL rally [-] NoSuchEngine: There is no engine with name `ExstingCloud`.
2014-05-04 11:15:53.754 3307 TRACE rally Traceback (most recent call last):
2014-05-04 11:15:53.754 3307 TRACE rally File "/opt/rally/bin/rally", line 10, in <module>
2014-05-04 11:15:53.754 3307 TRACE rally sys.exit(main())
2014-05-04 11:15:53.754 3307 TRACE rally File "/opt/rally/local/lib/python2.7/site-packages/rally/cmd/main.py", line 44, in main
2014-05-04 11:15:53.754 3307 TRACE rally return cliutils.run(sys.argv, categories)
2014-05-04 11:15:53.754 3307 TRACE rally File "/opt/rally/local/lib/python2.7/site-packages/rally/cmd/cliutils.py", line 172, in run
2014-05-04 11:15:53.754 3307 TRACE rally ret = fn(*fn_args, **fn_kwargs)
2014-05-04 11:15:53.754 3307 TRACE rally File "/opt/rally/local/lib/python2.7/site-packages/rally/cmd/commands/deployment.py", line 88, in create
2014-05-04 11:15:53.754 3307 TRACE rally deployment = api.create_deploy(config, name)
2014-05-04 11:15:53.754 3307 TRACE rally File "/opt/rally/local/lib/python2.7/site-packages/rally/orchestrator/api.py", line 36, in create_deploy
2014-05-04 11:15:53.754 3307 TRACE rally deployment)
2014-05-04 11:15:53.754 3307 TRACE rally File "/opt/rally/local/lib/python2.7/site-packages/rally/deploy/engine.py", line 93, in get_engine
2014-05-04 11:15:53.754 3307 TRACE rally raise exceptions.NoSuchEngine(engine_name=name)
2014-05-04 11:15:53.754 3307 TRACE rally NoSuchEngine: There is no engine with name `ExstingCloud`.

existing.json likes this:
(rally)dev@dev-K42JE:~$ cat existing.json
{
    "name":"ExstingCloud",
    "endpoint": {
        "auth_url": "http://127.0.0.1:5000/v2.0",
        "username": admin,
        "password": password,
        "tenant_name": demo
    }
}

anyone can help me? If you need more information, please tell me.
Thanks.
[1] https://wiki.openstack.org/wiki/Rally/HowTo