Before anybody makes a thread about this, beginning with reverse factory v6.1.0, the Factorio Standard Library is now a requirement of this mod. This library has a bunch of well-optimized, and (somewhat) well-documented functions that allow my mod to have a LOT more freedom and be far more dynamic with its content, while (hopefully) reducing the amount of crashes on startup.
Anyone who updates from the 6.0.x to the 6.1.x versions will also need to download the Factorio Standard Library. If you are already using any of the Picker mods, then you should already have this library, and no further downloads will be needed. Otherwise, you can go to that page (linked above) and download the mod, update this mod, and everything will work properly.
Sorry for the inconvenience, but thanks for sticking around. Please report any bugs to a new thread, thanks!