[Closed] apply path constraint using mapped operation?

hi there…i wanna to add Path_constraint COntoller and the path itself
like this
Box01 path constraint to Line01
Box02 path constraint to Line02
Box03 path constraint to Line03
and so on, it’s a mapped operation.
so i do this…
1.Create array of Box in good order–> called BoxArray (i’ve done this)
2.Create array of Line in good order–> called LineArray (i’ve done this)
3.then i create for loop below:

pathCon=path_constraint()
for i=1 to 20 do
(
	BoxArray[i].position.controller[3].controller=pathCon
	BoxArray[i].position.controller.setActive 3
	BoxArray[i].position.controller.path_constraint.controller.path = LineArray [i]
)

all the box has PathContsraint as active controller but the target path is not correct…
all the box has target path :Line20

i don’t know whats wrong because i think this simple algorithm can do this correctly