So i asked this in Bukkit Help but someone suggested I ask it here so. I'm working on fixing a plugin for my server but I ran in to a problem. Can anyone explain to me what importing this does and what its used for import net.minecraft.server.v1_5_R3.BiomeBase; import net.minecraft.server.v1_5_R3.ChunkProviderGenerate; import net.minecraft.server.v1_5_R3.WorldType; import org.bukkit.craftbukkit.v1_5_R3.CraftWorld; It might be just that i have never had to use it but i could use some help.