can not start ensemble

[skypexu]

Erlang R16B03 (erts-5.10.4) [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]

Eshell V5.10.4 (abort with ^G)
(a@e7440)1> application:load(crypto).
ok
(a@e7440)2> application:load(riak_ensemble).
ok
(a@e7440)3> application:set_env(riak_ensemble, data_root, "/tmp/riak").
ok
(a@e7440)4> application:start(riak_ensemble).
ok
(a@e7440)5> riak_ensemble_manager:enable().
ok
(a@e7440)6>
=INFO REPORT==== 18-Jan-2015::13:48:33 ===
application: riak_ensemble
exited: shutdown
type: temporary