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I recently made a modpack that was running fine until recently when I've been crashing and getting this error. I run it with 3 gb of RAM and it never reaches that limit so I cant tell what the problem is

2014-07-28 10:31:05 [INFO] [STDERR] java.lang.OutOfMemoryError: PermGen space
2014-07-28 10:31:05 [INFO] [STDERR] at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
2014-07-28 10:31:05 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2014-07-28 10:31:05 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2014-07-28 10:31:05 [INFO] [STDERR] at Reflector.callVoid(Reflector.java:128)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1661)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1119)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:946)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.client.main.Main.main(SourceFile:101)
2014-07-28 10:31:05 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2014-07-28 10:31:05 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2014-07-28 10:31:05 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2014-07-28 10:31:05 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
2014-07-28 10:31:05 [INFO] [STDERR] at net.minecraft.launchwrapper.Launch.main(Launch.java:27)