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What is causing this error?


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I am trying to run a forge server with forge 6.4.45.951(Yes, I know it isn't the newest version of forge.) It works great when I run it on client and LAN but it gives an error for a dedicated sever.

 

2013-12-14 16:22:31 [sEVERE] [Minecraft-Server] Encountered an unexpected exception NoClassDefFoundError

java.lang.NoClassDefFoundError: org/lwjgl/LWJGLException

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: org.lwjgl.LWJGLException

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:102)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 6 more

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