Biome error: cannot find symbol message in build log

First things first I started making structures to spawn in a biome I wanted to make.. sadly the Biome I want those to spawn in gets marked as an error  like stated in the title in the build log! Am using the Fabric Mod Plugin if this has anything to do with it! If there is anything else I have to add to this to make this problem solvable lemme know-

I re-did said biome and it only gets errors if I put my said structures in.. What makes it happen?