Finding Non-existent Biome??

A Crash keeps happening to the server whenever I add the datapack basically server is trying to find a biome I removed called "ulti:aercloud_field" and then gave me this error, what do I do? preset in MapLike[{biomes:[{biome:"ulti:aercloud_fields",parameters:{continentalness:0.0f,depth:0.0f,erosion:0.0f,humidity:-1.0f,offset:0.0f,temperature:0.8f,weirdness:0.0f}}],type:"minecraft:multi_noise"}]; Failed to get element ResourceKey[minecraft:worldgen/biome / ulti:aercloud_fields]; List must have contents missed input: {"ulti:elysium":{generator:{biome_source:{biomes:[{biome:"ulti:aercloud_fields",parameters:{continentalness:0.0f,depth:0.0f,erosion:0.0f,humidity:-1.0f,offset:0.0f,temperature:0.8f,weirdness:0.0f}}],type:"minecraft:multi_noise"},settings:"minecraft:floating_islands",type:"minecraft:noise"},type:"ulti:elysium"}}