with id resolver crash

Mods loaded: 19
ModLoader 1.2.5
mod_CodeChickenCore 0.5.2
mod_BuildCraftCore 2.2.14
mod_BuildCraftBuilders 2.2.14
mod_BuildCraftEnergy 2.2.14
mod_BuildCraftFactory 2.2.14
mod_BuildCraftTransport 2.2.14
mod_AdditionalPipes 2.1.3 (Minecraft 1.2.5, Buildcraft 2.2.14, Forge 3.0.1.75)
mod_CraftingTableIII (Beta1.6, MC1.2.5)
mod_MinecraftForge 3.1.3.107
mod_ModLoaderMp 1.2.4v1
mod_NotEnoughItems 1.2.2
mod_ComputerCraft 1.33
mod_CCTurtle 1.33
mod_IC2 v1.95
mod_Railcraft 5.2.1
mod_WirelessRedstoneCore 1.2.1
mod_WirelessRedstoneAddons 1.2.1
mod_Forestry 1.4.4.4

      Minecraft has crashed!
      ----------------------

Minecraft has stopped running because it encountered a problem.




--- BEGIN ERROR REPORT 41c4ac7d --------
Generated 21/05/12 03:10

Minecraft: Minecraft 1.2.5
OS: Windows 7 (amd64) version 6.1
Java: 1.7.0_04, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: GeForce GTX 275/PCIe/SSE2 version 3.3.0, NVIDIA Corporation

java.lang.IllegalArgumentException: Slot 202 is already occupied by railcraft.common.detector.BlockDetector@3521275a when adding forestry.cultivation.BlockFirSapling@139ea0f6
	at pb.<init>(Block.java:249)
	at qk.<init>(SourceFile:11)
	at qk.<init>(SourceFile:19)
	at zc.<init>(SourceFile:19)
	at forestry.cultivation.BlockFirSapling.<init>(BlockFirSapling.java:18)
	at forestry.config.ConfigureBlocks.initialize(ConfigureBlocks.java:52)
	at forestry.config.Config.load(Config.java:174)
	at forestry.ForestryCore.load(ForestryCore.java:88)
	at forestry.ForestryClient.load(ForestryClient.java:100)
	at mod_Forestry.load(mod_Forestry.java:31)
	at ModLoader.init(ModLoader.java:891)
	at ModLoader.addAllRenderers(ModLoader.java:189)
	at ahu.<init>(RenderManager.java:86)
	at ahu.<clinit>(RenderManager.java:14)
	at net.minecraft.client.Minecraft.a(Minecraft.java:394)
	at net.minecraft.client.Minecraft.run(Minecraft.java:732)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT c6a1f441 ----------