Detailed walkthrough of mods which rely on missing Create mod classes:
Mod: alloyed-1.20.1-c6.0.0-v2.0.jar
Missing classes of create:
com/simibubi/create/foundation/data/recipe/MechanicalCraftingRecipeBuilder

create-1.20.1-6.0.6.jar
forge-47.4.3
Minecraft 1,20,1