Biomes O'Plenty doesn't works correctly

Hello! There is a problem with my server. I decided to play a world with Biome O'Plenty's Mod, with my friends, but an error occurred. When I start and join the server with mod added, it adds only items of the mod, and not the biomes. Why does this happens? Please resolve this error soon

Quote from Roman

Go to the worlds page and click on generate. Enter BIOMESOP into the level-type field.

Please note that your current world gets deleted then.

Ok thanks!