FABIO AUGUSTO MENOCCI CAPPABIANCO writes:
The problem is: When the program get some data from a CGI form and try to compare with another one the following error message apears:
{ERROR: No handle found for thrown error error(existence_error(procedure,/(user:=,2)),/(user:=,2))}
What you are getting is the (toplevel) error message for an uncaught exception; this error message defaults to printing the term (also called 'ball') which was raised by the error. What happens (at least in this point) is that you are calling the predicate = of arity two (e.g., as in X = Y) and this predicate does not exist. You probably mean X == Y (if you want to test for inequality):
[2]> ciao Ciao-Prolog 1.9 #8: Mon May 27 19:52:33 CEST 2002 ?- a = 2. {ERROR: user:=/2 - undefined predicate}
no ?- a == 2.
yes
MCL
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