After loading the world successfully, some certain areas run well. However, when going inside some certain new areas, "shutting down internal serve" appear automatically.
The following is ForgeModLoader-client-0.log.
2013-01-10 01:43:51 [INFO] [STDERR] java.lang.NoClassDefFoundError: l
2013-01-10 01:43:51 [INFO] [STDERR] at a.<init>(CrashReport.java:27)
2013-01-10 01:43:51 [INFO] [STDERR] at a.a(CrashReport.java:319)
2013-01-10 01:43:51 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:673)
2013-01-10 01:43:51 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:599)
2013-01-10 01:43:51 [INFO] [STDERR] at bdz.q(IntegratedServer.java:123)
2013-01-10 01:43:51 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
2013-01-10 01:43:51 [INFO] [STDERR] at fy.run(SourceFile:849)
2013-01-10 01:43:51 [INFO] [STDOUT] Unloading Player: Samuel
2013-01-10 01:43:51 [INFO] [ForgeModLoader] [Thaumcraft] Removed 65 aura nodes when world 0 unloaded.
2013-01-10 01:43:52 [INFO] [ForgeModLoader] [Thaumcraft] Removed 0 aura nodes when world -1 unloaded.
2013-01-10 01:43:52 [INFO] [ForgeModLoader] [Thaumcraft] Removed 0 aura nodes when world 1 unloaded.
2013-01-10 01:43:52 [INFO] [ForgeModLoader] Unloading dimension 0
2013-01-10 01:43:52 [INFO] [ForgeModLoader] Unloading dimension -1
2013-01-10 01:43:52 [INFO] [ForgeModLoader] Unloading dimension 1
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod mcp
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod mcp
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod FML
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod FML
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod Forge
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod Forge
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod CodeChickenCore
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod CodeChickenCore
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod NotEnoughItems
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod NotEnoughItems
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod mod_ReiMinimap
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod mod_ReiMinimap
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod BuildCraft|Core
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod BuildCraft|Core
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod BuildCraft|Builders
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod BuildCraft|Builders
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod BuildCraft|Energy
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod BuildCraft|Energy
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod BuildCraft|Factory
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod BuildCraft|Factory
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod BuildCraft|Transport
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod BuildCraft|Transport
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod BuildCraft|Silicon
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod BuildCraft|Silicon
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod IC2
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod IC2
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod IC2NuclearControl
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod IC2NuclearControl
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerCore
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerCore
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerBase
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerBase
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerMachine
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerMachine
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerCompat
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerCompat
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerWiring
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerWiring
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerLogic
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerLogic
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerLighting
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerLighting
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerWorld
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerWorld
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod RedPowerControl
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod RedPowerControl
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sending event FMLServerStoppedEvent to mod Thaumcraft
2013-01-10 01:43:52 [FINER] [ForgeModLoader] Sent event FMLServerStoppedEvent to mod Thaumcraft
2013-01-10 01:43:52 [SEVERE] [ForgeModLoader] Fatal errors were detected during the transition from SERVER_STARTED to SERVER_STOPPED. Loading cannot continue
2013-01-10 01:43:52 [SEVERE] [ForgeModLoader]
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
CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap [mod_ReiMinimap] ([1.4.6]ReiMinimap_v3.2_06.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core [BuildCraft] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders [BC Builders] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy [BC Energy] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory [BC Factory] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport [BC Transport] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IC2 [IndustrialCraft 2] (industrialcraft-2_1.112.170-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IC2NuclearControl [Nuclear Control] (IC2NuclearControl-1.4.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerCore [RedPower] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerBase [RP Base] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerMachine [RP Machine] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerCompat [RP Compat] (RedPowerCompat-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerWiring [RP Wiring] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerLogic [RP Logic] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerLighting [RP Lighting] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerWorld [RP World] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RedPowerControl [RP Control] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Thaumcraft [Thaumcraft] (Thaumcraft3.0.1c.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
2013-01-10 01:43:52 [SEVERE] [ForgeModLoader] The following problems were captured during this phase
2013-01-10 01:43:52 [INFO] [STDERR] Exception in thread "Server thread" cpw.mods.fml.common.LoaderException
2013-01-10 01:43:52 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.transition(LoadController.java:117)
2013-01-10 01:43:52 [INFO] [STDERR] at cpw.mods.fml.common.Loader.serverStopped(Loader.java:752)
2013-01-10 01:43:52 [INFO] [STDERR] at cpw.mods.fml.common.FMLCommonHandler.handleServerStopped(FMLCommonHandler.java:459)
2013-01-10 01:43:52 [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:559)
2013-01-10 01:43:52 [INFO] [STDERR] at fy.run(SourceFile:849)
2013-01-10 01:43:53 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2013-01-10 01:43:53 [INFO] [STDOUT] Channel null in method 'stop'
2013-01-10 01:43:53 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2013-01-10 01:43:53 [INFO] [STDOUT] Channel null in method 'stop'
2013-01-10 01:43:53 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2013-01-10 01:43:53 [INFO] [STDOUT] Channel null in method 'stop'
2013-01-10 01:43:53 [INFO] [STDOUT] Error in class 'SourceLWJGL OpenAL'
2013-01-10 01:43:53 [INFO] [STDOUT] Channel null in method 'stop'
The following is ForgeModLoader-client-0.log.