map function not working

Hi. 
I'm trying to use the edit-point.jsx from your move-player-tutorial.

But i get always an "Exception has occured" : Error Code# 24: startTicks.map is not a function

I'm wondering if extend script is able to use ECMA-Script 5.1 which you need for the map-function. But in your video it's working.

Do you've a clou, what the problem could be?

