emqx plugin error :brod,{"no such file or directory","brod.app"}

[sfo-pourya]

My plugin installed completely on my emqx, but i can't activated it.
In emqx log file, i found it:
failed_to_start_plugin, reason: {brod,{"no such file or directory","brod.app"}}

this is my plugin rebar.config:

{deps,
    [ %% not all plugins have to depend on emqx
      %% but if they do, use git_subdir in the default profile
      {emqx, {git_subdir, "https://github.com/emqx/emqx.git", {tag, "v5.1.0"}, "apps/emqx"}}
    , {emqx_ctl, {git_subdir, "https://github.com/emqx/emqx.git", {tag, "v5.1.0"}, "apps/emqx_ctl"}}
    , {emqx_utils, {git_subdir, "https://github.com/emqx/emqx.git", {tag, "v5.1.0"}, "apps/emqx_utils"}}
    , {brod,{git,"https://github.com/klarna/brod", {tag, "4.3.2"}}}
    , {supervisor3,{git,"https://github.com/klarna/supervisor3", {tag, "1.1.9"}}}
    , {kafka_protocol,{git,"https://github.com/klarna/kafka_protocol", {tag, "4.0.3"}}}
   , {pc, {git, "https://github.com/blt/port_compiler", {tag, "v1.11.0"}}}
    , {map_sets, "1.1.0"}
    ]}.

{plugins, [
    {emqx_plugrel, {git, "https://github.com/emqx/emqx_plugrel.git", {tag, "0.3.0"}}},
    pc
]}.


{edoc_opts, [{preprocess, true}]}.


{erl_opts, [debug_info,warn_export_vars,warn_shadow_vars,warn_obsolete_guard,{i, "_build/default/plugins/pc/include"}
]}.


{xref_checks, [undefined_function_calls, undefined_functions,
  locals_not_used, deprecated_function_calls,
  warnings_as_errors, deprecated_functions]}.

{cover_enabled, true}.
{cover_opts, [verbose]}.


{relx, [ {release, {emqx_kafka_bridge, "1.0.0"}, %% this is the release version, different from app vsn in .app file
            [ emqx_kafka_bridge
            , map_sets
            ]}
       , {dev_mode, false}
       , {include_erts, false}
       ]}.
{port_specs, [
    {"priv/snappy_nif", ["c_src/*.cc"]}
]}.

{port_env, [
    {"CXXFLAGS", "$CXXFLAGS -std=c++11"},
    {"DRV_CFLAGS", "$DRV_CFLAGS -I/usr/include/erlang/erl_interface"}
]}.

[zmstone]

this should be sent to emqx.git but not here.
but I'm responsible here as well, i can answer the question.

you need to add the applications to be included in the plugin here:

{relx, [ {release, {emqx_kafka_bridge, "1.0.0"}, %% this is the release version, different from app vsn in .app file
            [ emqx_kafka_bridge,
            , brod
            , kafka_protocol
            , map_sets
            ]}
       , {dev_mode, false}
       , {include_erts, false

you probably don't need map_sets, because it's just an example.