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Here is the log of the error:

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 6/13/15 7:57 AM
Description: Reading NBT data

java.lang.ClassCastException: net.minecraft.nbt.NBTTagString cannot be cast to net.minecraft.nbt.NBTTagShort
at net.minecraft.nbt.NBTTagCompound.func_74765_d(SourceFile:120)
at net.minecraft.item.ItemStack.func_77963_c(ItemStack.java:207)
at net.minecraft.item.ItemStack.func_77949_a(ItemStack.java:105)
at net.minecraft.entity.player.InventoryPlayer.func_70443_b(InventoryPlayer.java:620)
at net.minecraft.entity.player.EntityPlayer.func_70037_a(EntityPlayer.java:950)
at net.minecraft.entity.player.EntityPlayerMP.func_70037_a(EntityPlayerMP.java:198)
at net.minecraft.entity.Entity.func_70020_e(Entity.java:1678)
at net.minecraft.server.management.ServerConfigurationManager.func_72380_a(ServerConfigurationManager.java:239)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:113)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
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:
---------------------------------------------------------------------------------------

-- Corrupt NBT tag --
Details:
Tag type found: STRING
Tag type expected: SHORT
Tag name: id
Stacktrace:
at net.minecraft.nbt.NBTTagCompound.func_74765_d(SourceFile:120)
at net.minecraft.item.ItemStack.func_77963_c(ItemStack.java:207)
at net.minecraft.item.ItemStack.func_77949_a(ItemStack.java:105)
at net.minecraft.entity.player.InventoryPlayer.func_70443_b(InventoryPlayer.java:620)
at net.minecraft.entity.player.EntityPlayer.func_70037_a(EntityPlayer.java:950)
at net.minecraft.entity.player.EntityPlayerMP.func_70037_a(EntityPlayerMP.java:198)

-- Entity being loaded --
Details:
Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
Entity ID: 56
Entity Name: kyan178
Entity's Exact location: -10399.43, 64.50, 6530.20
Entity's Block location: World: (-10400,64,6530), Chunk: (at 0,4,2 in -650,408; contains blocks -10400,0,6528 to -10385,255,6543), Region: (-21,12; contains chunks -672,384 to -641,415, blocks -10752,0,6144 to -10241,255,6655)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.entity.Entity.func_70020_e(Entity.java:1678)
at net.minecraft.server.management.ServerConfigurationManager.func_72380_a(ServerConfigurationManager.java:239)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:113)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
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: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 150617376 bytes (143 MB) / 348200960 bytes (332 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 240 (13440 bytes; 0 MB) allocated, 212 (11872 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 v6.4.50.1,345 Minecraft Forge 9.11.1.1345 22 mods loaded, 22 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.50.1,345} [Forge Mod Loader] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.1345} [Minecraft Forge] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Blokkit{v.1} [Blokkit] ([1.6.4] Blokkit v.1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
animalbikes{2} [AnimalBikes] (AnimalBikes_1.6.2-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ArchimedesShipsMod{1.6.4 v1.4.5} [Archimedes' Ships] (Archimedes-Ships-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{4.2.2} [BuildCraft] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{4.2.2} [BC Builders] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{4.2.2} [BC Energy] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{4.2.2} [BC Factory] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{4.2.2} [BC Transport] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{4.2.2} [BC Silicon] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ComputerCraft{1.57} [ComputerCraft] (ComputerCraft1.57.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CCTurtle{1.57} [ComputerCraft Turtles] (ComputerCraft1.57.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ConfigMod{v1.0} [Extended Mod Config] (ConfigMod for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoroAI{v1.0} [CoroAI] (CoroUtil for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FlansMod{4.1.1} [Flans Mod] (FlansMod-4.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IC2{2.0.397-experimental} [IndustrialCraft 2] (industrialcraft-2_2.0.397-experimental.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BlockMonsters{1.0} [Block Monsters] (xBlockMonsters v1.0 Mod for MC v1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMultipart{1.0.0.244} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
McMultipart{1.0.0.244} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMicroblock{1.0.0.244} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 27 (1512 bytes; 0 MB) allocated, 27 (1512 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'