Subscript out of Range - But Array is in different workbook

I have a WorkBook that has:

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on the Worksheet SO Addendum

Everything works great
But if I open a new workbook - and type in a cell I get Error 9 Subscript is out of range

When I click DeBug, it highlights

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I suppose there needs to be an Active Worksheet phrase or something.

Try :

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Yes! That was exactly it