Field calc failure, division?

Discussion created by forreste on Nov 4, 2011
Latest reply on Nov 6, 2011 by nahmed-esristaff
I'm trying to a percent change for some fields.  I have the amount increased by, and I have the previous value.  So I made a new field, and asked the field calc to [Increase] / [Previous].  It fails, and gives me the following.

General error executing calculator.
ERROR 999999: Error executing function.
Failed to execute (CalculateField).

It's a fairly basic operation, and works even on a cheap calculator.  Anyone know what I'm doing wrong?