Argument 'NPer' must be greater than zero
The NPer function, which returns a Double specifying the number of periods for an annuity based on periodic fixed payments and a fixed interest rate, requires an argument greater than zero.
To correct this error
Check the spelling of arguments in the expression. A misspelled variable name can implicitly create a numeric variable that is initialized to zero.
Check previous operations on variables in the expression, especially those passed into the procedure as arguments from other procedures.
See Also
Concepts
Passing Arguments by Value and by Reference