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Crash report from my server! HOW DO I FIX?


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Ok so I am using a custom modpack server and my server loads fine but then after a couple seconds it shows this...


Oh and btw I know this isn't the forum to be posting a crash report on but the Tracker isn't working so sorry. 


---- Minecraft Crash Report ----
// Why did you do that?
Time: 11/12/14 16:46
Description: Exception in server tick loop
java.lang.NoClassDefFoundError: net/minecraft/client/multiplayer/WorldClient
at net.minecraft.server.management.PlayerManager.<init>(PlayerManager.java:55)
at net.minecraft.world.WorldServer.<init>(WorldServer.java:113)
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:246)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:187)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.multiplayer.WorldClient
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 6 more
Caused by: java.lang.RuntimeException: Attempted to load class bdd for invalid side SERVER
at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)
... 8 more
I think it may be a mod but im not quite sure... Please help me with this error.
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