[Closed] Unknown system exception

Hi.

I’ve done a function that attach 2 point helpers to the end points of a line using a script controller. This is the function:

fn attachShapeToPoints P1 P2 =
(
	ss = SplineShape Pos:P1.pos
	addNewSpline ss
	addknot ss 1 #corner #line P1.pos
	addknot ss 1 #corner #line P2.pos
	updateShape ss
	
	local ctrlSource = \
		"if (isValidNode target) and (isValidNode owner) then
" +
		"	target.pos * ( inverse owner.transform)
" +
		"else [0,0,0]"
	
	animateVertex ss #all
	
	local ctrlP1 = Point3_Script()
	ctrlP1.addNode "target" P1
	ctrlP1.addNode "owner" ss
	ctrlP1.script = ctrlSource
	ctrlP1.update()
	ss[4][8][2].controller = ctrlP1 
		
	local ctrlP2 = Point3_Script()
	ctrlP2.addNode "target" P2
	ctrlP2.addNode "owner" ss
	ctrlP2.script = ctrlSource
	ctrlP2.update()
	ss[4][8][5].controller = ctrlP2
	
	OK
)

What it does is set the shape points to animatable and then assign the script controller to them so they keep attached to the point helpers.

It works fine if for example I call the function in the listener (or a new script document):

pt1 = Point pos: [-50,0,50]
pt2 = Point pos: [50,0,-50]
attachShapeToPoints pt1 pt2

But if I do the same in the “pressed” event handler of a button, it throws an unknown system exception in the line:

ss[4][8][2].controller = ctrlP1 

This is the test code:

rollout roTest "Test"
(
	button btnCreateShape "Create shape"
	
	on btnCreateShape pressed do
	(
		pt1 = Point pos: [-50,0,50]
		pt2 = Point pos: [50,0,-50]
		attachShapeToPoints pt1 pt2
	)
)

createDialog roTest

I have no idea what’s going on there. Does anybody knows what could be causing that?.

Thank you.