Reinforced Concrete Section Properties

[dokon]

Hello, I am trying to replicate the reinforced concrete section properties worksheet, but I am getting an error message. The error message is, "This array index is invalid. The index must be an integer, not less than origin, and not greater than the last element." I am strictly following the worksheet for this example and it is not working. Any ideas as to why this is happening? Worksheet is attached!

[MJG]

Toward the bottom of page 1, you have:

Where "i" is a literal subscript (Ctl+-).

You need to chage it to:

Where "i" is a matrix index ([).