some errors about rabbitmq-erlang-client - rabbitmq

Question

I'm trying to use rabbitmq-erlang-client, and confused about errors throwed by program.
I fllowed system_SUITE:queue_unbind/1 But errors are throwed when setting Exchange and Queue :
%% code
amqp_channel:call(Channel, #'exchange.declare'{exchange = X}),
amqp_channel:call(Channel, #'queue.declare'{queue = Q}),
%% it throw me same errors again and again:
** Last message in was setup_exchange_queue
** When Server state == {state,
{amqp_params_network,<<"username">>,<<"password">>,
<<"/">>,"192.168.1.173",5672,0,0,10,infinity,
none,
[#Fun<amqp_auth_mechanisms.plain.3>,
#Fun<amqp_auth_mechanisms.amqplain.3>],
[],[]},
<0.74.0>,<0.83.0>,<<"amq.direct">>,<<"queue">>,
<<"my_queue">>,undefined,undefined}
** Reason for termination ==
** {{noproc,{gen_server,call,[<0.83.0>,{close,200,<<"Goodbye">>},infinity]}},
[{gen_server,call,3,[{file,"gen_server.erl"},{line,212}]},
{mrbq,terminate,2,[{file,"src/mrbq.erl"},{line,244}]},
{gen_server,try_terminate,3,[{file,"gen_server.erl"},{line,643}]},
{gen_server,terminate,7,[{file,"gen_server.erl"},{line,809}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,240}]}]}
** exception exit: {noproc,
{gen_server,call,
[<0.83.0>,{close,200,<<"Goodbye">>},infinity]}}
code review amqp_channel.erl
%% call
call/2 -> gen_server:call/2
handle_call/3 -> handle_method_to_server/6
goto line 573, then line 888 ,and {noreply, State} returned for call as a result!!
What's wrong with above steps?
What should do to make it OK?
I have had tried cast/2,and no errors occur. But this is not what I need.