[1.63] Minecraft crashes

When I use turtle.refuel() or turtle.transferTo(), my client crushes. I play on Mac btw.

Here is the crash report after using the turtle.transferTo():

Time: 23.04.14 18:36
Description: Ticking tile entity
java.lang.NoSuchMethodError: net.minecraft.item.Item.getItemStackLimit(Lnet/minecraft/item/ItemStack;)I
at dan200.computercraft.shared.util.InventoryUtil.takeItems(InventoryUtil.java:301)
at dan200.computercraft.shared.util.InventoryUtil.takeItems(InventoryUtil.java:154)
at dan200.computercraft.shared.turtle.core.TurtleTransferToCommand.execute(TurtleTransferToCommand.java:31)
at dan200.computercraft.shared.turtle.core.TurtleBrain.updateCommands(TurtleBrain.java:776)
at dan200.computercraft.shared.turtle.core.TurtleBrain.update(TurtleBrain.java:92)
at dan200.computercraft.shared.turtle.blocks.TileTurtle.func_70316_g(TileTurtle.java:255)
at net.minecraft.world.World.func_72939_s(World.java:2209)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:552)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at dan200.computercraft.shared.util.InventoryUtil.takeItems(InventoryUtil.java:301)
at dan200.computercraft.shared.util.InventoryUtil.takeItems(InventoryUtil.java:154)
at dan200.computercraft.shared.turtle.core.TurtleTransferToCommand.execute(TurtleTransferToCommand.java:31)
at dan200.computercraft.shared.turtle.core.TurtleBrain.updateCommands(TurtleBrain.java:776)
at dan200.computercraft.shared.turtle.core.TurtleBrain.update(TurtleBrain.java:92)
at dan200.computercraft.shared.turtle.blocks.TileTurtle.func_70316_g(TileTurtle.java:255)
-- Tile entity being ticked --
Details:
Name: turtleadv // dan200.computercraft.shared.turtle.blocks.TileTurtleAdvanced
Block type: ID #1230 (tile.ccturtle // dan200.computercraft.shared.turtle.blocks.BlockTurtle)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (-956,10,-460), Chunk: (at 4,0,4 in -60,-29; contains blocks -960,0,-464 to -945,255,-449), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
Actual block type: ID #1230 (tile.ccturtle // dan200.computercraft.shared.turtle.blocks.BlockTurtle)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:2209)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:552)
-- Affected level --
Details:
Level name: FlatDemo
All players: 1 total; [EntityPlayerMP['qualpan1'/172, l='FlatDemo', x=-956,02, y=8,25, z=-457,77]]
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: -806976036189938785
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (-964,4,-469), Chunk: (at 12,0,11 in -61,-30; contains blocks -976,0,-480 to -961,255,-465), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
Level time: 62547 game time, 25336 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 20456 (now: false), thunder time: 18708 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Mac OS X (x86_64) version 10.9.2
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 113478928 bytes (108 MB) / 252817408 bytes (241 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 3220 (180320 bytes; 0 MB) allocated, 2967 (166152 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.3.883 Minecraft Forge 9.11.0.883 6 mods loaded, 6 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.3.883} [Forge Mod Loader] (minecraftforge-9.11.0.883.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.0.883} [Minecraft Forge] (minecraftforge-9.11.0.883.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems 1.6.1.9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ComputerCraft{1.63} [ComputerCraft] (ComputerCraft1.63.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 375 (21000 bytes; 0 MB) allocated, 312 (17472 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['qualpan1'/172, l='FlatDemo', x=-956,02, y=8,25, z=-457,77]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

P.S. i'm sorry if the format of the bug report is incorrect or if this bug was already discussed :)/>

This is caused by an out of date forge installation. update it.