** Using WeBWorK **

1. ERROR caught by Translator while processing problem file:
local/ECE514/HW3/ECE514_HW3_P2_hjt.pg **************** ERRORS from evaluating PG file:
 Can't locate object method "cmp" via package "80"
(perhaps you forgot to load "80"?) at line 83 of (eval 2672)

I had this happen before but it took me longer than I'd like to admit to determine that I'd not explicitly declared a perl variable as a MathObject.

I changed

$x = erf($t); # subroutine erf()

$x = Real(erf($t));