anchor.diff:  handle_info({hello, [Id, Hello_message], From}, State) ->
       io:format("HelloWorld: callback ~p, ~p~n", [Id, Hello_message]),
       %%     on_click(17, 123),
  -%%     gen_dbus:reply(From, {ok, ["Hello callback", " from Erlang service.erl"]}),
  -    gen_dbus:reply(From, {dbus_error, 'org.freedesktop.DBus.Error.Timeout', "Error from Erlang service.erl"}),
  +    gen_dbus:reply(From, {ok, ["Hello callback", " from Erlang service.erl"]}),
  +%%     gen_dbus:reply(From, {dbus_error, 'org.freedesktop.DBus.Error.Timeout', "Error from Erlang service.erl"}),
       {noreply, State};
   
   handle_info(Info, State) ->
  
positive.code:      {signature, [string], [{array, string}]}].
      
  
  'HelloWorld'([Id, Hello_message], From, State) ->
      {dbus_error, 'org.freedesktop.DBus.Error.InvalidArgs', "Invalid args", State}.
  
  %%     self() ! {hello, [Id, Hello_message], From},
  %%     {noreply, State}.
  
  %%     io:format("HelloWorld: ~p, ~p~n", [Id, Hello_message]),
  %% %%     on_click(17, 123),
  
negative.code: -module(hello).
  
  -include("dbus.hrl").
  
  -import(error_logger).
  -import(dberl.gen_dbus).
  