Cuando intento abrir mi server con el mod Biomes o' plenty se me cierra y me sale este error:

---- Minecraft Crash Report ----
// You're mean.

Time: 21/01/17 20:55
Description: Exception in server tick loop

Missing Mods:
Forge : [,)

at cpw.mods.fml.common.Loader.sortModList( :260)
at cpw.mods.fml.common.Loader.loadMods( 3)
at cpw.mods.fml.server.FMLServerHandler.beginServerLo ading(
at cpw.mods.fml.common.FMLCommonHandler.onServerStart (
at c_71197_b(
at net.minecraft.server.MinecraftServer$

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_111, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 34075744 bytes (32 MB) / 90664960 bytes (86 MB) up to 259522560 bytes (247 MB)
JVM Flags: 0 total;
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
U mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
U FML{} [Forge Mod Loader] (forge-1.7.10-
U Forge{} [Minecraft Forge] (forge-1.7.10-
U BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'

Alguien sabria como ayudarme a poder usar el mod BoP en un server?