When trying to run Better With Addons version 42 and Better With Mods version 2.3.3, it seems that turning on the HorsesBreedHaybales config option to let them breed by dropped haybales causes the game to crash upon hitting the PreInit stage of loading. The crash report can be found at this link: https://pastebin.com/pFs5WAz9

I had a quick look at the code, narrowing it down to the Interaction/InteractionBWA.java file in an attempt to figure out which config was crashing the game, and it seems like you are trying to access EXTRA_FOOD_ITEMS in Better With Mods that does not seem to exist anymore. I hope this can help!