Minecraft crash report

Bonjour,
J'ai un gros problème.
Voilà depuis 3 jours je ne peux accéder à aucune de mes maps (en solo)
à chaque fois que je lance une map, il y a marqué
"Shutting down internal server" puis sa charge, puis il y a marqué :
" java platform se binary "
et ensuite la fenêtre se ferme puis apparaît "Minecraft crash report"
Voilà ce qu'il y a marqué :

---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 15/03/14 11:32
Description: Exception generating new chunk

java.lang.OutOfMemoryError: GC overhead limit exceeded
at java.lang.Long.valueOf(Unknown Source)
at net.minecraft.world.gen.structure.MapGenStructure.func_151538_a(MapGenStructure.java:33)
at net.minecraft.world.gen.MapGenBase.func_151539_a(SourceFile:30)
at net.minecraft.world.gen.ChunkProviderFlat.func_73154_d(SourceFile:106)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:119)
at net.minecraft.server.management.PlayerManager$PlayerInstance.<init>(PlayerManager.java:452)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:209)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:199)
at net.minecraft.server.management.PlayerManager.func_72685_d(PlayerManager.java:382)
at net.minecraft.server.management.ServerConfigurationManager.func_72358_d(ServerConfigurationManager.java:273)
at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:411)
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137)
at net.minecraft.network.play.client.C03PacketPlayer$C06PacketPlayerPosLook.func_148833_a(SourceFile:20)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:211)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:680)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:568)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:705)


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

-- Head --
Stacktrace:
at java.lang.Long.valueOf(Unknown Source)
at net.minecraft.world.gen.structure.MapGenStructure.func_151538_a(MapGenStructure.java:33)
at net.minecraft.world.gen.MapGenBase.func_151539_a(SourceFile:30)
at net.minecraft.world.gen.ChunkProviderFlat.func_73154_d(SourceFile:106)

-- Chunk to be generated --
Details:
Location: -26,26
Position hash: 115964116966
Generator: FlatLevelSource
Stacktrace:
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:119)
at net.minecraft.server.management.PlayerManager$PlayerInstance.<init>(PlayerManager.java:452)
at net.minecraft.server.management.PlayerManager.getOrCreateChunkWatcher(PlayerManager.java:209)
at net.minecraft.server.management.PlayerManager.func_72690_a(PlayerManager.java:199)
at net.minecraft.server.management.PlayerManager.func_72685_d(PlayerManager.java:382)
at net.minecraft.server.management.ServerConfigurationManager.func_72358_d(ServerConfigurationManager.java:273)
at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:411)
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137)
at net.minecraft.network.play.client.C03PacketPlayer$C06PacketPlayerPosLook.func_148833_a(SourceFile:20)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:211)

-- Ticking connection --
Details:
Connection: net.minecraft.network.NetworkManager@7f49fc1
Stacktrace:
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:680)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:568)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:705)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 119482168 bytes (113 MB) / 954466304 bytes (910 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 10631 (595336 bytes; 0 MB) allocated, 10631 (595336 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.01-pre FML v7.2.116.1024 Minecraft Forge 10.12.0.1024 Optifine OptiFine_1.7.2_HD_C2 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{7.2.116.1024} [Forge Mod Loader] (forge-1.7.2-10.12.0.1024.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.12.0.1024} [Minecraft Forge] (forge-1.7.2-10.12.0.1024.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SDA{beta 2.0} [Le Chunk du Milieu] (Le Chunk du Milieu-beta 2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TooManyItems{1.7.2} [TooManyItems] (TooManyItems2014_01_13_1.7.2_Forge.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
voxelmap{1.7.2} [VoxelMap] (voxelmap-1.7.2-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 40 (2240 bytes; 0 MB) allocated, 31 (1736 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['WoolesLegend'/51, l='Ville de Pericraft', x=8,50, y=65,00, z=8,50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'