Modded Client Crashes After Trying to Join World.

So I downloaded about twenty mods for 1.12.2 and played with them for a while with occasional crashes that I could sometimes fix or fixed themselves.  But now every time I try to load into my world it crashes and this is the error code:

The game crashed whilst exception in server tick loop Error: java.util.ConcurrentModificationException Exit Code: -1

I can still load up the modded client and get to the home screen, but when I try to enter that world the game crashes.

Here are the mods I am using- Biomes O Plenty, Bloodmoon, Canny Composter, Dynamic Surroundings, FoodFunk, HardcoreDarkness, IvToolKit, Nutrition, OptiFine, OreLib, Realistic Torches, Recurrent Complex, Reskillable, RoguelikeDungeons, Roughtweaks, Ruins, SereneSeasons, ToughAsNails, WearableBackpacks, wumpleutil.

crash-2021-08-09_17.44.28-server.txt