pmlib.rs.KJUR.crypto.Signature returns undefined in pre request script

[Tanvir1080]

Hello, I'm trying to use this library for RSA256 asymmetric encryption and I've generated a generic private and public key pair, but when I do pmlib.rs.KJUR.crypto.Signature({"alg": "SHA256WithRsa"}); and then log it to verify it's created I get undefined and when I do sig.init(privateKey) i get an error saying "Cannot read properties of undefined (reading "init")"