Biomes O Plenty doesn't generate

I have created a 1.15.2 server with biomes o plenty installed client side and server side. I ensured to generate the world with "biomesoplenty". When I logged in I found that the server had the items of biomes o plenty but none of its biomes were loading in or generating. I tried regenerating the world multiple times but to no avail, it doesn't work. Any help at all?

Quote from WicHenery

Make sure you set the Worldtype to biomesoplenty, not Generator

I have done this, still doesn't work