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开启 emqx_extension_hook 和启动 emqx 服务后，出现如下错误：

2021-03-21 10:05:12.456 [error] [ExHook Driver] CALL java 'SampleHandler':init([]), unknown return: {'EXIT',{timeout,[{erlport,call,3,[{file,"erlport.erl"},{line,234}]},{emqx_extension_hook_driver,do_call,5,[{file,"emqx_extension_hook_driver.erl"},{line,280}]},{emqx_extension_hook_driver,do_init,2,[{file,"emqx_extension_hook_driver.erl"},{line,113}]},{emqx_extension_hook,enable,2,[{file,"emqx_extension_hook.erl"},{line,49}]},{emqx_extension_hook_app,load_all_drivers,1,[{file,"emqx_extension_hook_app.erl"},{line,66}]},{emqx_extension_hook_app,start,2,[{file,"emqx_extension_hook_app.erl"},{line,38}]},{application_master,start_it_old,4,[{file,"application_master.erl"},{line,277}]}]}}
2021-03-21 10:05:12.456 [error] [ExHook] Load driver java failed: unknown_return_format
2021-03-21 10:05:12.456 [error]   crasher:
    initial call: application_master:init/4
    pid: <0.1642.0>
    registered_name: []
    exception exit: {bad_return,
                        {{emqx_extension_hook_app,start,[normal,[]]},
                         {'EXIT',
                             {{badmatch,{error,unknown_return_format}},
                              [{emqx_extension_hook_app,load_all_drivers,1,
                                   [{file,"emqx_extension_hook_app.erl"},
                                    {line,66}]},
                               {emqx_extension_hook_app,start,2,
                                   [{file,"emqx_extension_hook_app.erl"},
                                    {line,38}]},
                               {application_master,start_it_old,4,
                                   [{file,"application_master.erl"},
                                    {line,277}]}]}}}}
      in function  application_master:init/4 (application_master.erl, line 138)
    ancestors: [<0.1641.0>]
    message_queue_len: 1
    messages: [{'EXIT',<0.1643.0>,normal}]
    links: [<0.1641.0>,<0.1288.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 610
    stack_size: 27
    reductions: 228
  neighbours:

2021-03-21 10:05:12.460 [error] [Plugins] Load plugin emqx_extension_hook failed, cannot start plugin emqx_extension_hook for {bad_return,{{emqx_extension_hook_app,start,[normal,[]]},{'EXIT',{{badmatch,{error,unknown_return_format}},[{emqx_extension_hook_app,load_all_drivers,1,[{file,"emqx_extension_hook_app.erl"},{line,66}]},{emqx_extension_hook_app,start,2,[{file,"emqx_extension_hook_app.erl"},{line,38}]},{application_master,start_it_old,4,[{file,"application_master.erl"},{line,277}]}]}}}}

能否请你帮忙？我已将 .jar 文件（io.emqx.extension.jar 和 erlport.jar ）和 .SampleHandler 放在 path = "/var/lib/emqx/extension/java/emqhook-java/bin/"

下面是我的配置文件（ emqx_extension_hook.conf ）

##====================================================================

##--------------------------------------------------------------------
## Driver confs

## Setup the supported drivers
##
## Value: python3 | java
exhook.drivers = java

## Search path for scripts/library
##
#exhook.drivers.python3.path = /var/lib/emqx/extension/
exhook.drivers.java.path = /var/lib/emqx/extension/java/emqhook-java/bin/
exhook.drivers.java.init_module = SampleHandler
## Call timeout
##
## Value: Duration
##exhook.drivers.python3.call_timeout = 5s

## Initial module name
##
##exhook.drivers.python3.init_module = main
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