ZeroMQ示例中的Erlang错误异常退出

Question

我运行 hwclient：main（）。或 hwserver：main（）。 来自erer的zeromq示例

https://github.com/zeromq/ezmq/blob/master/examples 来自链接 http://zeromq.org/bindings:erlang

并有错误＆＃34;例外退出＆＃34;

crasher:
    initial call: ezmq:init/1     pid: <0.42.0>     registered_name: []
    exception exit: {noproc,
                        {gen_server,call,
                            [ezmq_link_sup,{start_child,[]},infinity]}}
      in function  gen_server:terminate/6 (gen_server.erl, line 746)
    ancestors: [<0.31.0>]    messages: []    links: []    dictionary: []    trap_exit: true    status: running    heap_size: 376    stack_size: 27    reductions: 174
  neighbours:

** exception exit: {{noproc,
                        {gen_server,call,
                            [ezmq_link_sup,{start_child,[]},infinity]}},
                    {gen_server,call,
                        [<0.42.0>,{connect,tcp,{127,0,0,1},5555,[]}]}}
     in function  gen_server:call/2 (gen_server.erl, line 182)
     in call from hwclient:main/0 (/examples/hwclient.erl, line 15)

出了什么问题？