Problem with creating formulas in v 21.4

Stu
Stu Posts: 2
in Peer Support

I'm trying to create a formula in a column I've called Qty I need it to pull through wall areas or length or count etc. but when I go into Expressions I get the message

"An item with the same key has already been added" or "Expression Undefined"

Can anyone assist?

Stu

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