That is interesting.

emqtt seems to think that the auth module is called “emqtt_auth_z_mqtt_auth”.
When in fact it is called “emqtt_auth_zotonic”

What is your erlang.config configuration for emqtt?

It should be something like:

 {emqtt, [
    {auth, {zotonic, []}},
    {access_control, {zotonic, []}},
 

- Marc


> On 06 Nov 2016, at 15:41, heiheshang <[email protected]> wrote:
> 
> 2016-11-06 08:48:46.385 [error] <0.259.0> CRASH REPORT Process <0.259.0> with 
> 0 neighbours exited with reason: call to undefined function 
> emqtt_auth_z_mqtt_auth:init([]) in gen_server2:init_it/6 line 481
> 2016-11-06 08:48:46.385 [error] <0.258.0> Supervisor emqtt_sup had child 
> emqtt_auth started with emqtt_auth:start_link() at undefined exit with reason 
> call to undefined function emqtt_auth_z_mqtt_auth:init([]) in context 
> start_error
> 2016-11-06 08:48:46.386 [error] <0.256.0> CRASH REPORT Process <0.256.0> with 
> 0 neighbours exited with reason: no match of right hand value 
> {error,{shutdown,{failed_to_start_child,emqtt_auth,{undef,[{emqtt_auth_z_mqtt_auth,init,[[]],[]},{emqtt_auth,init,1,[{file,"src/emqtt_auth.erl"},{line,53}]},{gen_server2,init_it,6,[{file,"src/gen_server2.erl"},{line,447}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}}}}
>  in emqtt_app:start/2 line 36 in application_master:init/4 line 134
> 

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