error(existence_error(procedure, '/'(in, 4)), _114)

[eagerlearner]

Hello, I am running SWI-prolog with Perl. I got this kind of error.

error(existence_error(procedure, '/'(in, 4)), _114)

Does that mean that the predicate "in" with arity 4 does not exist ?
and what does that _114 variable bound for ? Thanks.

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