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So I was running minecraft perfectly no probs at all till I got a crash report when I was trying to make a minecraft superflat world now if I try to make a new world it says shutting down server and never loads I have to end minecraft from task manger BTW here's the error report and here's the list of mods I have installed smart moving Player API Mo Creatures Custom Mob Spawner GUI API Treecapitior Rei's minimap Friendoverlay Fancy GUI Inv Tweaks and finally MAthos

---- Minecraft Crash Report ----
// I feel sad now

Time: 4/20/13 12:43 PM
Description: Exception generating new chunk

java.lang.OutOfMemoryError: Java heap space
at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:9)
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.<init>(SourceFile:26)
at net.minecraft.world.gen.ChunkProviderFlat.func_73154_d(SourceFile:75)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:131)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:44)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:167)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:157)
at net.minecraft.server.management.PlayerManager.func_72683_a(PlayerManager.java:206)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:214)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:262)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:130)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:9)
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.<init>(SourceFile:26)
at net.minecraft.world.gen.ChunkProviderFlat.func_73154_d(SourceFile:75)

-- Chunk to be generated --
Details:
Location: 118,26
Position hash: 111669149814
Generator: FlatLevelSource
Stacktrace:
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:131)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:44)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:167)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:157)
at net.minecraft.server.management.PlayerManager.func_72683_a(PlayerManager.java:206)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:214)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:262)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:130)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 119428144 bytes (113 MB) / 954466304 bytes (910 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 187 (10472 bytes; 0 MB) allocated, 176 (9856 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.44 FML v5.1.8.611 Minecraft Forge 7.7.1.611 Optifine OptiFine_1.5.1_HD_U_C6 16 mods loaded, 16 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_bspkrsCore [bspkrsCore] ([1.5.1]bspkrsCorev2.02.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_SinglePlayerCommands [mod_SinglePlayerCommands] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_SmartMoving [Smart Moving] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_SmartRender [Smart Render] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TreeCapitator [TreeCapitator] ([1.5.1]TreeCapitator.Forge.1.5.1.r01.Uni.CoreMod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GuiAPI [GuiAPI] (GuiAPI-0.15.4-1.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap [mod_ReiMinimap] ([1.5.1]ReiMinimap_v3.3_04.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FriendsOverlay [FriendsOverlay] ([MC1.5.1]FriendsOverlay_3.1.1-1304131801-3-2c28100.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_FriendsOverlay [mod_FriendsOverlay] ([MC1.5.1]FriendsOverlay_3.1.1-1304131801-3-2c28100.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner [DrZhark's CustomSpawner] (CustomMobSpawner 1.12.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v5.1.1 DEV.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks [Inventory Tweaks] (InventoryTweaks-1.53.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_MAtmos [mod_MAtmos] (matmos_packaged.zip) 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: 1 / 8; [EntityPlayerMP['Shark4675'/21, l='Making potions and ­ing ­', x=1546.50, y=4.00, z=739.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge,fml'

Description: Exception generating new chunk , well this is an error generating a chunk

java.lang.OutOfMemoryError: Java heap space , this means the computer ran out of RAM so it couldnt keep making the world.
at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:9) and btw minecraft crashes when it runs out of RAM sometimes.
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.<init>(SourceFile:26)
at net.minecraft.world.gen.ChunkProviderFlat.func_73154_d(SourceFile:75)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:131)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:44)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:167)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:157)
at net.minecraft.server.management.PlayerManager.func_72683_a(PlayerManager.java:206)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:214)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:262)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:130)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

Quote from spymonkey14

Description: Exception generating new chunk , well this is an error generating a chunk

java.lang.OutOfMemoryError: Java heap space , this means the computer ran out of RAM so it couldnt keep making the world.
at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:9) and btw minecraft crashes when it runs out of RAM sometimes.
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.<init>(SourceFile:26)
at net.minecraft.world.gen.ChunkProviderFlat.func_73154_d(SourceFile:75)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:131)
at net.minecraft.server.management.PlayerInstance.<init>(PlayerInstance.java:44)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:167)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:157)
at net.minecraft.server.management.PlayerManager.func_72683_a(PlayerManager.java:206)
at net.minecraft.server.management.ServerConfigurationManager.func_72375_a(ServerConfigurationManager.java:214)
at net.minecraft.server.management.ServerConfigurationManager.func_72377_c(ServerConfigurationManager.java:262)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:130)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:171)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

Wait it ran out of RAM? that's off the wall I was at my friend's house and his computer has 16GB of RAM there's almost nothing that can crap that