setup not working bossbar command

mods/MISC/mcl_basic_commands/bossbar.lua

@@ -0,0 +1,31 @@
+local S = minetest.get_translator("mcl_commands")
+
+--1.13 feature
+--TODO: toggle it with setting/mod
+mcl_commands.register_command("bossbar", {
+	func = function(cmd)
+		cmd:sub("add", {
+			func = function(name)
+				return
+			end,
+		})
+		cmd:sub("set", {
+			func = function(name, target)
+				return
+			end,
+		})
+        cmd:sub("remove", {
+			func = function(name, target)
+				return
+			end,
+		})
+        cmd:sub("get", {
+			func = function(name, target)
+				return
+			end,
+		})
+	end,
+	description = "Can add, configure or remove a custom bossbar.",
+	params = S("[<target>]"),
+	privs = {server = true},
+})

mods/MISC/mcl_basic_commands/init.lua

@@ -2,13 +2,8 @@
 
 local modpath = minetest.get_modpath(minetest.get_current_modname())
 
-dofile(modpath.."/kill.lua")
-dofile(modpath.."/setblock.lua")
-dofile(modpath.."/seed.lua")
-dofile(modpath.."/summon.lua")
-dofile(modpath.."/say.lua")
-dofile(modpath.."/list.lua")
-dofile(modpath.."/sound.lua")
-dofile(modpath.."/title.lua")
+for _,filename in pairs({"kill", "setblock", "seed", "summon", "say", "list", "sound", "title", "bossbar"}) do
+    dofile(modpath.."/"..filename..".lua")
+end
 
 dofile(modpath.."/alias.lua")