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Here is my log:

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 7/15/14 9:27 PM
Description: Ticking entity

java.lang.OutOfMemoryError: Java heap space
at net.minecraft.network.packet.Packet51MapChunk.func_73594_a(Packet51MapChunk.java:276)
at net.minecraft.network.packet.Packet56MapChunks.<init>(Packet56MapChunks.java:55)
at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:298)
at micdoodle8.mods.galacticraft.core.entities.player.GCCorePlayerMP.func_70071_h_(GCCorePlayerMP.java:187)
at net.minecraft.world.World.func_72866_a(World.java:2350)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:719)
at net.minecraft.world.World.func_72870_g(World.java:2311)
at net.minecraft.world.World.func_72939_s(World.java:2157)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:550)
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 net.minecraft.network.packet.Packet51MapChunk.func_73594_a(Packet51MapChunk.java:276)
at net.minecraft.network.packet.Packet56MapChunks.<init>(Packet56MapChunks.java:55)
at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:298)
at micdoodle8.mods.galacticraft.core.entities.player.GCCorePlayerMP.func_70071_h_(GCCorePlayerMP.java:187)
at net.minecraft.world.World.func_72866_a(World.java:2350)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:719)
at net.minecraft.world.World.func_72870_g(World.java:2311)

-- Entity being ticked --
Details:
Entity Type: null (micdoodle8.mods.galacticraft.core.entities.player.GCCorePlayerMP)
Entity ID: 1246151
Entity Name: MatthewStevenGo
Entity's Exact location: -6.86, 61.00, 270.41
Entity's Block location: World: (-7,61,270), Chunk: (at 9,3,14 in -1,16; contains blocks -16,0,256 to -1,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:2157)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:550)

-- Affected level --
Details:
Level name: Pixelmon multiplayer
All players: 1 total; [GCCorePlayerMP['MatthewStevenGo'/1246151, l='Pixelmon multiplayer', x=-6.86, y=61.00, z=270.41]]
Chunk stats: ServerChunkCache: 843 Drop: 0
Level seed: 111199006
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (180,64,256), Chunk: (at 4,4,0 in 11,16; contains blocks 176,0,256 to 191,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 374615 game time, 418565 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 58467 (now: false), thunder time: 161154 (now: false)
Level game mode: Game mode: survival (ID 0). 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: Windows 7 (x86) version 6.1
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 20280 bytes (0 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 4572 (256032 bytes; 0 MB) allocated, 1010 (56560 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 2, tallocated: 64
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 35 mods loaded, 35 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
FLabsBF{4.0} [BetterFurnaces] ([1.6.4]BetterFurnacesV4.0.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.4]ReiMinimap_v3.4_01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
ArchimedesShipsMod{1.6.4 v1.4.5} [Archimedes' Ships] (ArchimedesShips.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->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->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->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->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->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->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->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->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->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->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->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->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
CloneCraft{1.2} [CloneCraft] (CloneCraft_v2.0_MC1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
CoFHCore{2.0.0.5} [CoFH Core] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
CoFHLoot{2.0.0.5} [CoFH Loot] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
CoFHMasquerade{2.0.0.5} [CoFH Masquerade] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
CoFHSocial{2.0.0.5} [CoFH Social] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
CoFHWorld{2.0.0.5} [CoFH World] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
GalacticraftCore{2.0.12} [Galacticraft Core] (Galacticraft-1.6.4-2.0.12.1010.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
GalacticraftMars{2.0.12} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.12.1010.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Guardmod{version 1.3} [Guardmod] (Guardsmod v1.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
KeithyUtils{1.2} [Keithy Utils] (KeithyUtils-1.6.4-1.2.16.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Metallurgy3Core{3.2.3} [Metallurgy 3 Core] (Metallurgy-1.6.4-3.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Metallurgy3Base{3.2.3} [Metallurgy 3 Base] (Metallurgy-1.6.4-3.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Metallurgy3Machines{3.2.3} [Metallurgy 3 Machines] (Metallurgy-1.6.4-3.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Metallurgy3Vanilla{3.2.3} [Metallurgy 3 Vanilla] (Metallurgy-1.6.4-3.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
MoreSwordsMod{2.6.0} [More Swords Mod] (More Swords Mod 2.6.0 For 1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
pixelmon{3.0.4} [Pixelmon] (Pixelmon_3.0.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Steve{1.1} [SteveMod] (Steve-Mod-for-164.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
ForgeMultipart{1.0.0.219} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
McMultipart{1.0.0.219} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
ForgeMicroblock{1.0.0.219} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2264 (126784 bytes; 0 MB) allocated, 161 (9016 bytes; 0 MB) used
Player Count: 1 / 8; [GCCorePlayerMP['MatthewStevenGo'/1246151, l='Pixelmon multiplayer', x=-6.86, y=61.00, z=270.41]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

It occured when displaying "out of memory". Can anyone explain this?