#INVALID COLUMN VALUE Error, when using a formula with a column set as Date

Hi,

I'm encountering difficulties changing the Dates of certain cells using a Formula. In this instance, I write

=WORKDAY([Date used in Formula]@row + 10

while referencing a Column set as Date type, and it still gives me the Invalid Column Value error. I'm really confused can Someone help me.

Additional infomartion: There is a conditional formating set on the entire sheet if that somehow could cause an error.

Thanks

Answers