[Closed] trouble with spinner and convertToSplineShape

I apologize in advance in case I am making some incredibly obvious mistake.
The objective is to set the z value of a section object using a spinner and convert the section to a spline.
Note that if executing without using the rollout the lines for creating the section and convertToSplineShape seem to work fine.

Thanks in advance for any feedback.

rollout a "DWG Extraction Assistant" width:168 height:100
(
	spinner spn1 range:[0,1000,48] type:#integer
	label lbl1 "cut plane h."
	button btn1 "section" width:120 height:24
	on btn1 pressed  do
	(
		s = section length:1000 width:1000 pos:[0,0,spn1.value] isSelected:on
		convertToSplineShape s --this does not work
	)
)
createDialog a