ambari-shell throw "Cannot get property 'items' on null object"

[Lian Jiang]

Hi,

I am using ambari-shell docker (
http://blog.sequenceiq.com/blog/2014/05/26/ambari-shell/). However,

docker run -it --rm sequenceiq/ambari-shell --ambari.host=localhost
--ambari.port=8080

threw error "Cannot get property 'items' on null object" even I can use
ambari web UI to sign in localhost:8080 using admin/admin.

Any idea will be highly appreciated!