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[SEVERE] Encountered an unexpected exception NoSuchMethodError
java.lang.NoSuchMethodError: net.minecraft.src.ModLoader.getMinecraftInstance()Lnet/minecraft/client/Minecraft;
at BlockTimberTree.func_71852_a(BlockTimberTree.java:19)
at net.minecraft.world.chunk.Chunk.func_76592_a(Chunk.java:715)
at net.minecraft.world.World.func_72832_d(World.java:554)
at net.minecraft.world.World.func_94571_i(World.java:683)
at net.minecraft.block.Block.removeBlockByPlayer(Block.java:1629)
at net.minecraft.item.ItemInWorldManager.func_73079_d(ItemInWorldManager.java:275)
at net.minecraft.item.ItemInWorldManager.func_73084_b(ItemInWorldManager.java:308)
at net.minecraft.item.ItemInWorldManager.func_73074_a(ItemInWorldManager.java:170)
at net.minecraft.network.NetServerHandler.func_72510_a(NetServerHandler.java:491)
at net.minecraft.network.packet.Packet14BlockDig.func_73279_a(SourceFile:46)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:461)
at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:134)
at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:274)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

just simpley a server log of a crash that happens when ever i break a block of wood trying to use forge and and the timber mod i was wondering if some one could help explain whats going on and why it keeps crashing and how i could fix it