Formula Issue

Shaun Bailey

So this Formula works =COUNTIF({Skills}, [Primary Column]@row) and this works as well =COUNTIF({Month}, 5) but when i combine them =COUNTIFS({Skills}, [Primary Column]@row, {Month}, 5) I get #IncorrectArgument Set. Why is this?

Paul Newcome

Are both cross sheet references pointing to the same sheet? Are they both single column ranges?