有大神帮我看看规则哪里出错了么，这是一个种树的规则，话费有酬

@range("MIN" ,"MDL")
attr size = "MDL"
Lot-->
scatter(surface,1, uniform){CreatTree}
CreatTree-->
case size == "MDL":
alignScopeToAxes()
i(fileRandom(assets/objTree/*.obj))
s(float xSize, float ySize, float zSize)
center(xz)
else :
alignScopeToAxes()
i(fileRandom("assets/Plants/*.obj"))
s(float xSize, float ySize, float zSize)
center(xz)