39.67.5 MP every 5 seconds I got this both in server and client log:

1539477757369 -----------------------------------------
1539477757369 STACK TRACE
1539477757369 -----------------------------------------
1539477757369 function: OnClientCommand -- file: NocturnalZombiesServer.lua line # 32
java.lang.RuntimeException: Object tried to call nil in OnClientCommand
at se.krka.kahlua.vm.KahluaUtil.fail(KahluaUtil.java:83)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:975)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:167)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1922)
at se.krka.kahlua.vm.KahluaThread.pcallvoid(KahluaThread.java:1777)
at se.krka.kahlua.integration.LuaCaller.pcallvoid(LuaCaller.java:67)
at se.krka.kahlua.integration.LuaCaller.protectedCallVoid(LuaCaller.java:130)
at zombie.Lua.Event.trigger(Event.java:37)
at zombie.Lua.LuaEventManager.triggerEvent(LuaEventManager.java:181)
at zombie.network.GameServer.receiveClientCommand(GameServer.java:5393)
at zombie.network.GameServer.mainLoopDealWithNetData(GameServer.java:2907)
at zombie.network.GameServer.main(GameServer.java:744)

Did I installed it wrong?