gregtech/1.0.6FTB crash

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 11/19/12 3:58 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: Slot 4095 is already occupied by forestry.arboriculture.gadgets.BlockLog@2389b9bd when adding gregtechmod.common.blocks.GT_BlockMetaID_Block@27013985
	at alf.<init>(Block.java:292)
	at gregtechmod.common.blocks.GT_BlockMetaID_Block.<init>(GT_BlockMetaID_Block.java:27)
	at gregtechmod.GT_Mod.load(GT_Mod.java:521)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:440)
	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
	at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
	at com.google.common.eventbus.EventBus.post(EventBus.java:268)
	at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:140)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
	at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
	at com.google.common.eventbus.EventBus.post(EventBus.java:268)
	at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:83)
	at cpw.mods.fml.common.Loader.initializeMods(Loader.java:651)
	at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:88)
	at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:347)
	at hg.c(DedicatedServer.java:110)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:454)
	at fp.run(SourceFile:818)

Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.6.0_29, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 105387368 bytes (100 MB) / 115539968 bytes (110 MB) up to 1888419840 bytes (1800 MB)
- JVM Flags: 0 total;
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- FML: ~ERROR~ NullPointerException: null
- Is Modded: Definitely; 'forge,fml'
- Profiler Position: N/A (disabled)
- Type: Dedicated Server