diff --git a/Zframework/bgm.lua b/Zframework/bgm.lua
index 0b9057ce..dc1a7f5c 100644
--- a/Zframework/bgm.lua
+++ b/Zframework/bgm.lua
@@ -2,6 +2,8 @@ local BGM={
 	default=false,
 	getList=function()error("Can't getList before initialized!")end,
 	getCount=function()return 0 end,
+	loadOne=function()error("Cannot load before init!")end,
+	loadAll=function()error("Cannot load before init!")end,
 	play=NULL,
 	freshVolume=NULL,
 	stop=NULL,
diff --git a/Zframework/image.lua b/Zframework/image.lua
index 61a75840..7ccf8eb9 100644
--- a/Zframework/image.lua
+++ b/Zframework/image.lua
@@ -1,5 +1,7 @@
 local IMG={
 	getCount=function()return 0 end,
+	loadOne=function()error("Cannot load before init!")end,
+	loadAll=function()error("Cannot load before init!")end,
 }
 function IMG.init(list)
 	IMG.init=nil
diff --git a/Zframework/sfx.lua b/Zframework/sfx.lua
index b1925ece..196e7691 100644
--- a/Zframework/sfx.lua
+++ b/Zframework/sfx.lua
@@ -1,5 +1,7 @@
 local SFX={
 	getCount=function()return 0 end,
+	loadOne=function()error("Cannot load before init!")end,
+	loadAll=function()error("Cannot load before init!")end,
 	fieldPlay=NULL,
 	play=NULL,
 	fplay=NULL,
diff --git a/Zframework/sysFX.lua b/Zframework/sysFX.lua
index b2764fe8..7e0616d6 100644
--- a/Zframework/sysFX.lua
+++ b/Zframework/sysFX.lua
@@ -3,7 +3,6 @@ local gc_setColor,gc_setLineWidth=gc.setColor,gc.setLineWidth
 local gc_draw,gc_line=gc.draw,gc.line
 local gc_rectangle,gc_circle=gc.rectangle,gc.circle
 
-local sin,cos=math.sin,math.cos
 local max,min=math.max,math.min
 local rnd=math.random
 local ins,rem=table.insert,table.remove
diff --git a/Zframework/voice.lua b/Zframework/voice.lua
index 72f5855d..b07ac867 100644
--- a/Zframework/voice.lua
+++ b/Zframework/voice.lua
@@ -1,6 +1,8 @@
 local VOC={
 	getCount=function()return 0 end,
 	getQueueCount=function()return 0 end,
+	loadOne=function()error("Cannot load before init!")end,
+	loadAll=function()error("Cannot load before init!")end,
 	getFreeChannel=NULL,
 	play=NULL,
 	update=NULL,
diff --git a/parts/skin.lua b/parts/skin.lua
index bdd05d23..7152e852 100644
--- a/parts/skin.lua
+++ b/parts/skin.lua
@@ -1,5 +1,7 @@
 local SKIN={
 	getCount=function()return 0 end,
+	loadOne=function()error("Cannot load before init!")end,
+	loadAll=function()error("Cannot load before init!")end,
 	prevSet=NULL,
 	nextSet=NULL,
 	prev=NULL,