GetMatElement() does not correspond to anything

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Leadwerks

Here is my function for writing the hierarchy:

Function XWriteBones(bone,f,tab$="")
WriteLine(f,tab+"Frame "+Entityname(bone))
WriteLine(f,tab+"	{")
WriteLine(f,tab+"	FrameTransformMatrix")
WriteLine(f,tab+"		{")
temp=CreatePivot()
PositionEntity temp,EntityX(bone),EntityY(bone),EntityZ(bone)
RotateEntity temp,EntityPitch(bone),EntityYaw(bone),EntityRoll(bone)
WriteLine(f,tab+"		"+GetMatElement(temp,0,0)+","+GetMatElement(temp,0,1)+","+GetMatElement(temp,0,2)+",0.0,")
WriteLine(f,tab+"		"+GetMatElement(temp,1,0)+","+GetMatElement(temp,1,1)+","+GetMatElement(temp,1,2)+",0.0,")
WriteLine(f,tab+"		"+GetMatElement(temp,2,0)+","+GetMatElement(temp,2,1)+","+GetMatElement(temp,2,2)+",0.0,")
WriteLine(f,tab+"		"+EntityX(temp)+","+EntityY(temp)+","+EntityZ(temp)+",1.0;;")
WriteLine(f,tab+"		}")
FreeEntity temp
For c=1 To CountChildren(bone)
	XWriteBones(GetChild(bone,c),f,tab+"	")
	Next
WriteLine(f,tab+"	}")
End Function