diff --git a/apps/emqx_dashboard/src/emqx_dashboard_api.erl b/apps/emqx_dashboard/src/emqx_dashboard_api.erl
index adbf73f53..81d7965d0 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_api.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_api.erl
@@ -25,7 +25,6 @@
 
 -import(hoconsc, [
     mk/2,
-    % ref/2,
     array/1,
     enum/1
     ]).
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_cli.erl b/apps/emqx_dashboard/src/emqx_dashboard_cli.erl
index 63d48c36d..675f015a4 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_cli.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_cli.erl
@@ -31,8 +31,6 @@ admins(["add", Username, Password, Desc]) ->
     case emqx_dashboard_admin:add_user(bin(Username), bin(Password), bin(Desc)) of
         {ok, _} ->
             emqx_ctl:print("ok~n");
-        {error, already_existed} ->
-            emqx_ctl:print("Error: already existed~n");
         {error, Reason} ->
             emqx_ctl:print("Error: ~p~n", [Reason])
     end;
diff --git a/apps/emqx_dashboard/src/emqx_dashboard_schema.erl b/apps/emqx_dashboard/src/emqx_dashboard_schema.erl
index c2482f91b..404648b14 100644
--- a/apps/emqx_dashboard/src/emqx_dashboard_schema.erl
+++ b/apps/emqx_dashboard/src/emqx_dashboard_schema.erl
@@ -147,12 +147,14 @@ bind(desc) -> ?DESC(bind);
 bind(_) -> undefined.
 
 default_username(type) -> binary();
+default_username(default) -> "admin";
 default_username(required) -> true;
 default_username(desc) -> ?DESC(default_username);
 default_username('readOnly') -> true;
 default_username(_) -> undefined.
 
 default_password(type) -> binary();
+default_password(default) -> "public";
 default_password(required) -> true;
 default_password('readOnly') -> true;
 default_password(sensitive) -> true;
diff --git a/scripts/merge-i18n.escript b/scripts/merge-i18n.escript
index 13a7df27b..e32e82d0f 100755
--- a/scripts/merge-i18n.escript
+++ b/scripts/merge-i18n.escript
@@ -3,8 +3,7 @@
 -mode(compile).
 
 main(_) ->
-    {ok, BaseConf} = file:read_file("apps/emqx_dashboard/i18n/emqx_dashboard_i18n.conf"),
-
+    BaseConf = <<"">>,
     Cfgs = get_all_cfgs("apps/"),
     Conf = [merge(BaseConf, Cfgs),
             io_lib:nl()
@@ -23,7 +22,7 @@ merge(BaseConf, Cfgs) ->
       end, BaseConf, Cfgs).
 
 get_all_cfgs(Root) ->
-    Apps = filelib:wildcard("*", Root) -- ["emqx_machine", "emqx_dashboard"],
+    Apps = filelib:wildcard("*", Root) -- ["emqx_machine"],
     Dirs = [filename:join([Root, App]) || App <- Apps],
     lists:foldl(fun get_cfgs/2, [], Dirs).