Mod (cela doit être lié aux mods) Minecraft Crash =(

Un autre crash report :

Code:
---- Minecraft Crash Report ----
// I'm sorry, Dave.
 
Time: 05/10/13 19:20
Description: Exception in server tick loop
 
java.lang.NoClassDefFoundError: ModDragonfire/gen/ChunkProviderIcedNether
    at ModDragonfire.gen.WorldProviderIcedNether.func_76555_c(WorldProviderIcedNether.java:53)
    at net.minecraft.world.WorldServer.func_72970_h(WorldServer.java:728)
    at net.minecraft.world.World.<init>(World.java:291)
    at net.minecraft.world.WorldServer.<init>(WorldServer.java:110)
    at net.minecraft.world.WorldServerMulti.<init>(WorldServerMulti.java:13)
    at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:62)
    at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:142)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)
    at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.ClassNotFoundException: ModDragonfire.gen.ChunkProviderIcedNether
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 9 more
Caused by: java.lang.ClassFormatError: Duplicate method name&signature in class file ModDragonfire/gen/ChunkProviderIcedNether
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
    ... 11 more
 
 
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
 
-- System Details --
Details:
    Minecraft Version: 1.6.4
    Operating System: Windows Vista (x86) version 6.0
    Java Version: 1.7.0_25, Oracle Corporation
    Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
    Memory: 78528048 bytes (74 MB) / 196284416 bytes (187 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
    Suspicious classes: FML and Forge are installed
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP v8.11 FML v6.4.20.916 Minecraft Forge 9.11.1.916 Optifine OptiFine_1.6.4_HD_U_C5 12 mods loaded, 12 mods active
    mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    FML{6.4.20.916} [Forge Mod Loader] (minecraftforge-9.11.1.916.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    Forge{9.11.1.916} [Minecraft Forge] (minecraftforge-9.11.1.916.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    CodeChickenCore{0.9.0.6} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    NotEnoughItems{1.6.1.5} [Not Enough Items] (Not-Enough-Items-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    mod_bspkrsCore{v3.05(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev3.05.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    mod_ArmorStatusHUD{v1.13(1.6.4)} [ArmorStatusHUD] ([1.6.4]ArmorStatusHUDv1.13.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    ModDragonfire{Alpha 0.3.0} [Dragonfire's Mod] ([1.6.4]Dragonfire's Mod Alpha 0.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.4]ReiMinimap_v3.4_01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    inventorytweaks{1.56} [Inventory Tweaks] (InventoryTweaks-MC1.6.2-1.56-b77.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    mod_ZanMinimap{0.9.4} [Zan's Minimap] (ZansMinimap1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
    Profiler Position: N/A (disabled)
    Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    Player Count: 0 / 8; []
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'fml,forge'