Dear All

I am trying to have the following argument state that IF
AR2="closed",Then return "Not Required" but I keep getting an error.
Would anyone be able to help me with this?

=IF(AK3<=5,"",IF(AK3<=10,"Almost
Due",IF(AK3<=15,"Overdue",IF(AK315,"Very Overdue"))))

Thank you
Scoooter