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I know I should be using the atlauncher websire but here I get better descriptions. Here is the crash report

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 1/8/15 10:36 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:188)
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:188)
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: 713
Entity Name: mj0koga123
Entity's Exact location: -220.50, 90.00, 242.50
Entity's Block location: World: (-221,90,242), Chunk: (at 3,5,2 in -14,15; contains blocks -224,0,240 to -209,255,255), 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: New World
All players: 1 total; [GCCorePlayerMP['mj0koga123'/713, l='New World', x=-220.50, y=90.00, z=242.50]]
Chunk stats: ServerChunkCache: 734 Drop: 0
Level seed: -4584843108398464298
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-212,64,248), Chunk: (at 12,4,8 in -14,15; contains blocks -224,0,240 to -209,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 57 game time, 57 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 37723 (now: false), thunder time: 42486 (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 8 (amd64) version 6.2
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 25912 bytes (0 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)
Mod Pack: Unknown / None
LiteLoader Mods: 0 loaded mod(s)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -XX:-OmitStackTraceInFastThrow -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xms256M -Xmx1024M -XX:PermSize=256M
AABB Pool Size: 5827 (326312 bytes; 0 MB) allocated, 3009 (168504 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 6, tallocated: 62
FML: ~~ERROR~~ OutOfMemoryError: Java heap space
TConstruct Environment: Environment seems clean, however you are using a modpack; please report it to the pack author, not us!
Ender-Quarry Relfection Code:: No problems here
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1957 (109592 bytes; 0 MB) allocated, 744 (41664 bytes; 0 MB) used
Player Count: 1 / 8; [GCCorePlayerMP['mj0koga123'/713, l='New World', x=-220.50, y=90.00, z=242.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'