Forum Academy Marketplace Showcase Pricing Features

How to get elements of field that is list

Hi, i need help because i cant get list elements. I try this solution:

But it doesnt work for me.
That is my field -


That is my code -

Error -

what I should do?

properties.list.get(0,properties.list.length())

.length()

Not

.length

I did that u said. But i have another error now -