Only values of 1 and 2 should respond with an error. It's possible this was a recent change on PayPals end or even just a temporary issue, but I see no official notice that it should be removed so I'm not sure what to suggest. Have you tried contacting PayPal?
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I have, but I am being passed around to various people, and each one is not understanding what the problem is So far no luck with getting any official info.
I finally reached tech support at PayPal so I could ask my question. I will post here their official reply. In the mean time, the work around is to comment out that variable.