The second argument to foreach is not a list. The second argument is

[Snake_Eyes]

This is the same message I get every time I make a call from Google Spreadsheets to the Data app.

This is from my blog

This is an extension

[Powertech_Development (Delight Elisha)]

You are doing it the wrong way, For each item in list treats the items in list one after the other so you can not use select list item here, what you have to do is to create an empty list and for each item in list you add the item to the empty list created. After this you can now select index 2 from the list you added each item to.

[Decoder_360 (The Decoder 360)]

Try Like This

For Getting Single Column

[Still-learning (1-2-3-4...)]

Why Do you use extension this?
You can use gviz or csv method to get data from gsheet