problemi with a lisp

[check]

Good evening to all,
I'm trying to use a lisp but I can't. I hope someone gives me a hand. the lisp in question is prfter that is present in pick3.7. this lisp draws the cross section of a plot with quotas, gradients, partial and progressive distances. lisp usage on autocad 2010, I don't think it's a problem. the problem in question is that when I turn the lisp in the end it gives me this error: "error: type of wrong topic: lselsetp nil". and I can't generate anything. which could be the problem and how to solve it. Thank you.

 

[Giuseppe Mauro]

do not ask me why but it is passed somewhere at the lisp, an invalid data (like a real instead of an entire or something like this), or expects to find a variable with a data that instead finds nothing (empty)

you should examine and track the lisp