为什么会出错

woshiminzi

serverApi.GetSystem("Script_NeteaseModzadltMVr","BlankClient").NotifyToClient("OnGUISetting",{})

会出现NoneTypeTraceback (most recent call last):  File "mod/common/system/eventBus.py", line 278, in Post  File "mod/common/system/eventHandler.py", line 27, in Call  File "Script_NeteaseModzadltMVr.NeteaseServerSystem", line 15, in OnServerCommandAttributeError: 'NoneType' object has no attribute 'NotifyToClient'要怎么改