=IF([Deadline for implementing this project]@row - [Submission Date]@row < 30, 3, IF([Deadline for implementing this project]@row - [Submission Date]@row > 60, 1, IF(AND([Deadline for implementing this project]@row - [Submission Date]@row <= 60, [Deadline for implementing this project]@row - [Submission Date]@row >= 30, 2))))
I get the error for when rows' [Deadline for implementing this project] - [Submission Date] is greater than 30 but less than 60.