Need help with modded Minecraft!

#1 Apr 20, 2014
MourningsAngel
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Today I started making a modpack for myself to use and screw around with. I fixed everything noticeable, and when I start up minecraft, it starts just fine, going straight to the main menu. However, once I get to creating a new world it will say "Generating World" then blank out as if it's about to let me in, and then crash.

Heres the error that I get at the end:

[INFO] [STDERR] Exception in thread "Thread-1" Exception in thread "Minecraft main thread" java.lang.OutOfMemoryError: PermGen space

2014-04-21 00:20:59 [INFO] [STDERR] java.lang.OutOfMemoryError: PermGen space

2014-04-21 00:21:23 [INFO] [STDERR] java.lang.NoClassDefFoundError: net/minecraft/world/CallableLvl2

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.world.World.func_72914_a(World.java:4420)

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:673)

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

2014-04-21 00:21:23 [INFO] [STDERR] Caused by: java.lang.ClassNotFoundException: net.minecraft.world.CallableLvl2

2014-04-21 00:21:23 [INFO] [STDERR] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)

2014-04-21 00:21:23 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2014-04-21 00:21:23 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2014-04-21 00:21:23 [INFO] [STDERR] ... 6 more

2014-04-21 00:21:23 [INFO] [STDERR] Caused by: java.lang.OutOfMemoryError: PermGen space

2014-04-21 00:21:24 [INFO] [Minecraft-Server] Stopping server

2014-04-21 00:21:24 [INFO] [Minecraft-Server] Saving players

2014-04-21 00:21:25 [INFO] [STDERR] java.lang.OutOfMemoryError: PermGen space

2014-04-21 00:21:26 [INFO] [STDERR] Exception in thread "Server thread" java.lang.OutOfMemoryError: PermGen space

Now I can obviously read what it says to know what the error is but how do you fix it?
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#2 Apr 22, 2014
legoman1216
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Right, search Google for a parameter that lets you allocate more RAM to Minecraft (this only works on 64-bit windows) and I think that will solve it.

Just type into Google:
How to allocate more RAM to Minecraft

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