The title say everything

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 2014-11-26 10:11
Description: Ticking block entity

java.lang.NoClassDefFoundError: cofh/api/energy/IEnergyProvider
at mekanism.common.util.CableUtils.isOutputter(CableUtils.java:144)
at mekanism.common.util.CableUtils.getConnections(CableUtils.java:114)
at mekanism.common.util.CableUtils.emit(CableUtils.java:215)
at mekanism.common.tile.TileEntityEnergyCube.onUpdate(TileEntityEnergyCube.java:68)
at mekanism.common.tile.TileEntityBasicBlock.func_145845_h(TileEntityBasicBlock.java:59)
at net.minecraft.world.World.func_72939_s(World.java:1939)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: cofh.api.energy.IEnergyProvider
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 12 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 14 more

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

-- Head --
Stacktrace:
at mekanism.common.util.CableUtils.isOutputter(CableUtils.java:144)
at mekanism.common.util.CableUtils.getConnections(CableUtils.java:114)
at mekanism.common.util.CableUtils.emit(CableUtils.java:215)
at mekanism.common.tile.TileEntityEnergyCube.onUpdate(TileEntityEnergyCube.java:68)
at mekanism.common.tile.TileEntityBasicBlock.func_145845_h(TileEntityBasicBlock.java:59)

-- Block entity being ticked --
Details:
Name: EnergyCube // mekanism.common.tile.TileEntityEnergyCube
Block type: ID #206 (tile.EnergyCube // mekanism.common.block.BlockEnergyCube)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (405,4,1495), Chunk: (at 5,0,7 in 25,93; contains blocks 400,0,1488 to 415,255,1503), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Actual block type: ID #206 (tile.EnergyCube // mekanism.common.block.BlockEnergyCube)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1939)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

-- Affected level --
Details:
Level name: New World
All players: 1 total; [EntityPlayerMP['k0nazagul'/45, l='New World', x=407,50, y=4,00, z=1492,50]]
Chunk stats: ServerChunkCache: 440 Drop: 0
Level seed: -6706967298120260168
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (415,4,1501), Chunk: (at 15,0,13 in 25,93; contains blocks 400,0,1488 to 415,255,1503), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)
Level time: 1315 game time, 1315 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 98211 (now: false), thunder time: 88251 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 93871000 bytes (89 MB) / 320204800 bytes (305 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
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 v7.10.85.1230 Minecraft Forge 10.13.2.1230 15 mods loaded, 15 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1230} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1230} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{6.1.8} BuildCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{6.1.8} BC Builders Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{6.1.8} BC Energy Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{6.1.8} BC Factory Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{6.1.8} BC Transport Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{6.1.8} BC Silicon Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMultipart{1.1.0.314} Forge Multipart Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mekanism{7.1.1} Mekanism Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MekanismGenerators{7.1.1} MekanismGenerators Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MekanismTools{7.1.1} MekanismTools Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
McMultipart{1.1.0.314} Minecraft Multipart Plugin Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMicroblock{1.1.0.314} Forge Microblocks Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['k0nazagul'/45, l='New World', x=407,50, y=4,00, z=1492,50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

BC's CoFH API is outdated, try installing CoFHLib to fix.