Error Creating user changing passwords and login to admin console

[jdhdineshkumara]

i cannot create users and log into rabbitmq , error gives.

[root@tch sbin]# service rabbitmq-server start
Starting rabbitmq-server: SUCCESS
rabbitmq-server.
[root@tch sbin]#

[root@tch sbin]# ./rabbitmqctl add_user test test
Creating user "test" ...
Error: {'EXIT',{undef,[{xmerl_ucs,from_utf8,[<<"test">>]},
                       {rabbit_binary_parser,validate_utf8,1},
                       {rabbit_control_main,list_to_binary_utf8,1},
                       {lists,map,2},
                       {rabbit_control_main,call,2},
                       {rabbit_control_main,start,0},
                       {init,start_it,1},
                       {init,start_em,1}]}}

[root@tch sbin]# ./rabbitmqctl change_password test test
Changing password for user "test" ...
Error: {'EXIT',{undef,[{xmerl_ucs,from_utf8,[<<"test">>]},
                       {rabbit_binary_parser,validate_utf8,1},
                       {rabbit_control_main,list_to_binary_utf8,1},
                       {lists,map,2},
                       {rabbit_control_main,call,2},
                       {rabbit_control_main,start,0},
                       {init,start_it,1},
                       {init,start_em,1}]}}

[root@tch sbin]# ./rabbitmqctl list_users
Listing users ...
guest [administrator]
...done.

what is the problem with my rabbitmq installation.