With just the default LSPDFR files in data/custom it still throws an absurd amount of exceptions when you load. It doesn't seem to cause any problems in game, but it's pretty obnoxious. A lot of them are from LSPDFR's EUP configs being outdated, and the LSPDFR making the assumption you're using RDE, which there is absolutely 0 reason to use these days, and creating agency loadouts with "hwaycar1-4."
I don't use any of the custom xmls so I tried deleting them to get rid of the 100s of lines of exceptions in the log. Well, that crashes the plugin and the game never loads, so that's not ideal.
The solution is to ignore it, just like the devs are. It makes absolutely no sense not to open source LSPDFR at this point. It would be miles ahead of where it is now if they'd done it all along, and they'd get paypal donations just the same.