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When I play a certain server I end up crashing a few minutes in. The game drops to 0FPS rapidly, making it unplayable. I managed to disconnect from the server and tried to join another, but got this error. No one else playing that server experiences the error.

---- Minecraft Crash Report ----
// You're mean.
Time: 2/15/13 6:39 PM
Description: Ticking screen
java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at bar.<init>(SourceFile:16)
at bba.a(SourceFile:312)
at bav.a(SourceFile:1497)
at yc.a(SourceFile:842)
at ayp.a(SourceFile:134)
at yc.d(SourceFile:834)
at ayp.d(SourceFile:116)
at ayp.a(SourceFile:160)
at ayh.a(NetClientHandler.java:421)
at cq.a(SourceFile:68)
at cg.b(SourceFile:349)
at ayh.d(NetClientHandler.java:90)
at ayk.c(SourceFile:69)
at net.minecraft.client.Minecraft.l(SourceFile:1113)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Unknown Source)
at bar.<init>(SourceFile:16)
at bba.a(SourceFile:312)
at bav.a(SourceFile:1497)
at yc.a(SourceFile:842)
at ayp.a(SourceFile:134)
at yc.d(SourceFile:834)
at ayp.d(SourceFile:116)
at ayp.a(SourceFile:160)
at ayh.a(NetClientHandler.java:421)
at cq.a(SourceFile:68)
at cg.b(SourceFile:349)
at ayh.d(NetClientHandler.java:90)
at ayk.c(SourceFile:69)
-- Affected screen --
Details:
Screen name: ~~ERROR~~ NullPointerException: null
-- Affected level --
Details:
Level name: MpServer
All players: 9 total; [ays['Malcolt3'/2574029, l='MpServer', x=392.03, y=69.62, z=322.77], bah['BigBoy1905'/2541173, l='MpServer', x=385.91, y=68.00, z=321.16], bah['mr_cowfingers'/2556944, l='MpServer', x=379.06, y=59.00, z=337.09], bah['jaxkarine'/2409654, l='MpServer', x=376.19, y=59.00, z=336.28], bah['highheat222'/2564629, l='MpServer', x=382.66, y=68.00, z=322.28], bah['§abks34'/2556277, l='MpServer', x=383.19, y=68.00, z=317.50], bah['RDW6B'/2559706, l='MpServer', x=390.00, y=58.00, z=315.88], bah['TNTbedbugs'/2412308, l='MpServer', x=386.28, y=57.00, z=315.31], bah['LJR732'/2551331, l='MpServer', x=424.41, y=68.00, z=319.22]]
Chunk stats: MultiplayerChunkCache: 10
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (1691,69,-220), Chunk: (at 11,4,4 in 105,-14; contains blocks 1680,0,-224 to 1695,255,-209), Region: (3,-1; contains chunks 96,-32 to 127,-1, blocks 1536,0,-512 to 2047,255,-1)
Level time: 281840848 game time, 282364329 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 41 total; [mc['entity.ItemFrame.name'/68, l='MpServer', x=413.94, y=84.50, z=318.50], mc['entity.ItemFrame.name'/69, l='MpServer', x=413.94, y=85.50, z=318.50], mc['entity.ItemFrame.name'/70, l='MpServer', x=413.94, y=83.50, z=318.50], bah['mr_cowfingers'/2556944, l='MpServer', x=379.06, y=59.00, z=337.09], mc['entity.ItemFrame.name'/76, l='MpServer', x=413.94, y=85.50, z=324.50], mc['entity.ItemFrame.name'/77, l='MpServer', x=413.94, y=84.50, z=324.50], mc['entity.ItemFrame.name'/78, l='MpServer', x=413.94, y=83.50, z=324.50], mc['entity.ItemFrame.name'/79, l='MpServer', x=413.94, y=86.50, z=321.50], oz['Cow'/2566057, l='MpServer', x=396.47, y=67.00, z=347.41], bah['BigBoy1905'/2541173, l='MpServer', x=385.91, y=68.00, z=321.16], bah['TNTbedbugs'/2412308, l='MpServer', x=386.28, y=57.00, z=315.31], mc['entity.ItemFrame.name'/93, l='MpServer', x=400.94, y=85.50, z=344.50], ays['Malcolt3'/2574029, l='MpServer', x=392.03, y=69.62, z=322.77], bah['LJR732'/2551331, l='MpServer', x=424.41, y=68.00, z=319.22], bah['jaxkarine'/2409654, l='MpServer', x=376.19, y=59.00, z=336.28], mc['entity.ItemFrame.name'/95, l='MpServer', x=400.94, y=85.50, z=348.50], mc['entity.ItemFrame.name'/94, l='MpServer', x=400.94, y=85.50, z=346.50], oz['Cow'/2564920, l='MpServer', x=399.13, y=67.00, z=348.69], bah['RDW6B'/2559706, l='MpServer', x=390.00, y=58.00, z=315.88], py['Minecart'/32, l='MpServer', x=388.50, y=57.85, z=311.50], bah['§abks34'/2556277, l='MpServer', x=383.19, y=68.00, z=317.50], mc['entity.ItemFrame.name'/100, l='MpServer', x=408.06, y=85.50, z=348.50], py['Minecart'/33, l='MpServer', x=388.50, y=57.85, z=313.50], bah['highheat222'/2564629, l='MpServer', x=382.66, y=68.00, z=322.28], mc['entity.ItemFrame.name'/98, l='MpServer', x=414.94, y=85.50, z=350.50], mc['entity.ItemFrame.name'/38, l='MpServer', x=394.06, y=85.50, z=346.50], mc['entity.ItemFrame.name'/99, l='MpServer', x=408.06, y=85.50, z=350.50], mc['entity.ItemFrame.name'/39, l='MpServer', x=394.06, y=85.50, z=344.50], bah['TNTbedbugs'/2412308, l='MpServer', x=386.28, y=57.00, z=315.31], mc['entity.ItemFrame.name'/96, l='MpServer', x=400.94, y=85.50, z=350.50], mc['entity.ItemFrame.name'/36, l='MpServer', x=394.06, y=85.50, z=348.50], mc['entity.ItemFrame.name'/97, l='MpServer', x=414.94, y=85.50, z=348.50], mc['entity.ItemFrame.name'/37, l='MpServer', x=394.06, y=85.50, z=350.50], oz['Cow'/2531056, l='MpServer', x=401.38, y=67.00, z=349.19], bah['jaxkarine'/2409654, l='MpServer', x=376.19, y=59.00, z=336.28], bah['highheat222'/2564629, l='MpServer', x=382.66, y=68.00, z=322.28], bah['mr_cowfingers'/2556944, l='MpServer', x=379.06, y=59.00, z=337.09], bah['§abks34'/2556277, l='MpServer', x=383.19, y=68.00, z=317.50], bah['RDW6B'/2559706, l='MpServer', x=390.00, y=58.00, z=315.88], bah['BigBoy1905'/2541173, l='MpServer', x=385.91, y=68.00, z=321.16], oz['Cow'/2563531, l='MpServer', x=399.34, y=67.00, z=345.25]]
Retry entities: 0 total; []
Stacktrace:
at ayp.a(SourceFile:281)
at net.minecraft.client.Minecraft.b(SourceFile:1871)
at net.minecraft.client.Minecraft.run(SourceFile:543)
at java.lang.Thread.run(Unknown Source)
-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_13, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 443806784 bytes (423 MB) / 519114752 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 63347 (3547432 bytes; 3 MB) allocated, 10817 (605752 bytes; 0 MB) used
Suspicious classes: ModLoader, EntityRendererProxy, ModTextureStatic, ...[Acme.ThreadFactory, ThreadPool, SimpleBuffer, ...], [Acme.Serve.Serve, WarDeployer, PathTreeDictionary, ...], [javax.servlet.Servlet, ServletContext, RequestDispatcher, ...], [javax.servlet.http.HttpSessionContext, HttpSession, HttpServlet, ...], [net.techbrew.mcjm.JourneyMap, Constants, WorldType, ...], [net.techbrew.mcjm.io.FileHandler, ChunkImageCache, CacheMap, ...], [net.techbrew.mcjm.log.JMLogger, LogFormatter], [net.techbrew.mcjm.render.MapBlocks, ChunkRenderer], [net.techbrew.mcjm.server.JMServer, JMServ, FileServlet, ...], [net.techbrew.mcjm.thread.JMThreadFactory, UpdateThreadBase, PlayerUpdateThread, ...], [net.techbrew.mcjm.ui.MapOverlay, ZoomLevel]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
ModLoader: Mods loaded: 2
ModLoader 1.4.7
mod_JourneyMap 1.9.1
LWJGL: 2.4.2
OpenGL: GeForce GTX 660M/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used