I'm trying to install TFC 0.77 following this guide (http://terrafirmacraft.com/wiki/Installation). Everything works fine until I try adding the TFC zip file to the mods folder when Minecraft crashes. I have downloaded/installed Forge .837 and am running a Forge profile. [spoiler] ---- Minecraft Crash Report ---- // My bad.Time: 19/08/13 15:08Description: Initializing gamejava.lang.IllegalArgumentException: Slot 173 is already occupied by net.minecraft.block.Block@71cc2b7a when adding TFC.Blocks.BlockFruitLeaves@133a90f4at net.minecraft.block.Block.<init>(Block.java:348)at TFC.Blocks.BlockTerra.<init>(BlockTerra.java:21)at TFC.Blocks.BlockFruitLeaves.<init>(BlockFruitLeaves.java:37)at TFC.TFCBlocks.LoadBlocks(TFCBlocks.java:456)at TFC.TerraFirmaCraft.preInit(TerraFirmaCraft.java:90)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:540)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:74)at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)at com.google.common.eventbus.EventBus.post(EventBus.java:267)at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:194)at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)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:74)at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)at com.google.common.eventbus.EventBus.post(EventBus.java:267)at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:105)at cpw.mods.fml.common.Loader.loadMods(Loader.java:521)at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:181)at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:470)at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:796)at net.minecraft.client.main.Main.main(SourceFile:101)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 net.minecraft.launchwrapper.Launch.launch(Launch.java:57)at net.minecraft.launchwrapper.Launch.main(Launch.java:18)A detailed walkthrough of the error, its code path and all known details is as follows:----------------------------------------------------------------------------------------- Head --Stacktrace:at net.minecraft.block.Block.<init>(Block.java:348)at TFC.Blocks.BlockTerra.<init>(BlockTerra.java:21)at TFC.Blocks.BlockFruitLeaves.<init>(BlockFruitLeaves.java:37)at TFC.TFCBlocks.LoadBlocks(TFCBlocks.java:456)at TFC.TerraFirmaCraft.preInit(TerraFirmaCraft.java:90)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:540)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:74)at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)at com.google.common.eventbus.EventBus.post(EventBus.java:267)at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:194)at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)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:74)at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)at com.google.common.eventbus.EventBus.post(EventBus.java:267)at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:105)at cpw.mods.fml.common.Loader.loadMods(Loader.java:521)at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:181)at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:470)-- Initialization --Details:Stacktrace:at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:796)at net.minecraft.client.main.Main.main(SourceFile:101)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 net.minecraft.launchwrapper.Launch.launch(Launch.java:57)at net.minecraft.launchwrapper.Launch.main(Launch.java:18)-- System Details --Details:Minecraft Version: 1.6.2Operating System: Windows 7 (amd64) version 6.1Java Version: 1.7.0_25, Oracle CorporationJava VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle CorporationMemory: 207637032 bytes (198 MB) / 470417408 bytes (448 MB) up to 954466304 bytes (910 MB)JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1GAABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) usedSuspicious classes: FML and Forge are installedIntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0FML: MCP v8.04 FML v6.2.52.837 Minecraft Forge 9.10.0.837 4 mods loaded, 4 mods activemcp{8.04} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initializedFML{6.2.52.837} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initializedForge{9.10.0.837} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initializedterrafirmacraft{0.77.0} [TerraFirmaCraft] (TFC-0.77.0.zip) Unloaded->Constructed->ErroredLaunched Version: 1.6.2-Forge9.10.0.837LWJGL: 2.9.0OpenGL: GeForce GTX 560/PCIe/SSE2 GL version 4.3.0, NVIDIA CorporationIs Modded: Definitely; Client brand changed to 'fml,forge'Type: Client (map_client.txt)Resource Pack: DefaultCurrent Language: English (US)Profiler Position: N/A (disabled)Vec3 Pool Size: ~~ERROR~~ NullPointerException: null [/spoiler] Any idea why?