Unfortunately, the verbose log doesn't help me in any way. All I see are a bunch of attempts by other mods to add ingredients and technology unlocks without checking if those exist, but nothing from my own mod. Even running pypostprocessing by itself with Reverse Factory causes the error, and it doesn't give me a line number or function name or anything else that might be useful in tracking down what the issue might be.
I've opened a discussion on their page here, which might eventually help me track down the problem, or might just result in being marked as an incompatibility from their side, if they can't help. I don't see this specific error message anywhere else on their discussion tab, so it must be something unique to this mod.