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This is the error i get when i try to install Mo Creatures.
Edit: I may have accidentally un-installed custom mob spawners. I will update on this topic soon.
2012-12-19 14:56:16 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.NoClassDefFoundError: Ldrzhark/customspawner/CustomSpawner; 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.Class.getDeclaredFields0(Native Method) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.Class.privateGetDeclaredFields(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.Class.getDeclaredField(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.common.ProxyInjector.inject(ProxyInjector.java:42) 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:417) 2012-12-19 14:56:16 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 2012-12-19 14:56:16 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:268) 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:140) 2012-12-19 14:56:16 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 2012-12-19 14:56:16 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300) 2012-12-19 14:56:16 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:268) 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:83) 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.common.Loader.loadMods(Loader.java:478) 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:151) 2012-12-19 14:56:16 [INFO] [STDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:424) 2012-12-19 14:56:16 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:756) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] Caused by: java.lang.ClassNotFoundException: drzhark.customspawner.CustomSpawner 2012-12-19 14:56:16 [INFO] [STDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:141) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] at java.lang.ClassLoader.loadClass(Unknown Source) 2012-12-19 14:56:16 [INFO] [STDERR] ... 30 more 2012-12-19 14:56:16 [INFO] [STDERR] Caused by: java.lang.NullPointerException