well,recently i spent some times trying to add a fallout biome to the map generator, full of gravel and a custom terrain.it was going well until i realised with one of the new updates,a "workerClass" has been added to each biome .i'm new to modding so i just thought leaving it as a clone of arid shrub land would be fine,either making it spawn similarly or replace it.but unfortunately nothing generated on a new map,so i changed it to "BiomeWorker_Fallout" ,thinking it'll make a new class,but that just created an error.
i need help fixing this,ive been looking for where these classes are stored for 2 hours with no luck.remember,i'm new to modding so please be specific when answering

ps this biomeworker workerclass code can be found in the biome_arid file,under each arid biome in the game.