Il crash tout le temps
Regarde le crash.report :
---- Minecraft Crash Report ----
// Don't do that.
Time: 01/06/13 19:13
Description: Exception in server tick loop
java.lang.NullPointerException
at net.minecraft.server.v1_5_R2.DedicatedServer.am(De
dicatedServer.java:257)
at net.minecraft.server.v1_5_R2.DedicatedServer.a(Ded
icatedServer.java:203)
at net.minecraft.server.v1_5_R2.MinecraftServer.run(M
inecraftServer.java:416)
at net.minecraft.server.v1_5_R2.ThreadServerApplicati
on.run(SourceFile:573)
A detailed walkthrough of the error, its code path and all known details is as follows:
--------------------------------------------------
-------------------------------------
-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_07, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 986408600 bytes (940 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xmx1024M -Xms1024M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: [net.minecraft.server.v1_5_R2.ICommandListener, IMojangStatistics, IDataManager, ...], [org.bukkit.World, BlockChangeDelegate, Server], [org.bukkit.block.BlockState], [org.bukkit.command.CommandSender, RemoteConsoleCommandSender], [org.bukkit.configuration.serialization.Configurat
ionSerializable],
[org.bukkit.craftbukkit.Main], [org.bukkit.craftbukkit.libs.jline.TerminalFactory
,
Terminal, Flavor, ...], [org.bukkit.craftbukkit.libs.jline.console.Console
Reader,
CursorBuffer, ConsoleKeys, ...], [org.bukkit.craftbukkit.libs.jline.console.complet
er.CompletionHandler,
CandidateListCompletionHandler], [org.bukkit.craftbukkit.libs.jline.console.history
.History,
MemoryHistory], [org.bukkit.craftbukkit.libs.jline.internal.InputS
treamReader,
Configuration, Log], [org.bukkit.craftbukkit.libs.joptsimple.OptionExce
ption,
OptionParser, OptionSpec, ...], [org.bukkit.craftbukkit.libs.joptsimple.internal.A
bbreviationMap,
ReflectionException, Reflection, ...], [org.bukkit.craftbukkit.v1_5_R2.LoggerOutputStream
,
CraftServer], [org.bukkit.craftbukkit.v1_5_R2.inventory.CraftIte
mStack,
CraftInventory, CraftInventoryDoubleChest, ...], [org.bukkit.craftbukkit.v1_5_R2.potion.CraftPotion
EffectType],
[org.bukkit.craftbukkit.v1_5_R2.util.Waitable, ServerShutdownThread, TerminalConsoleHandler, ...], [org.bukkit.entity.Entity], [org.bukkit.event.Event, Cancellable, HandlerList, ...], [org.bukkit.event.block.BlockEvent, BlockFadeEvent, BlockGrowEvent, ...], [org.bukkit.event.entity.EntityEvent, EntityInteractEvent, EntityDamageEvent, ...], [org.bukkit.event.hanging.HangingEvent, HangingPlaceEvent], [org.bukkit.event.inventory.InventoryMoveItemEvent
],
[org.bukkit.event.painting.PaintingEvent, PaintingPlaceEvent], [org.bukkit.event.player.PlayerEvent, PlayerInteractEvent, PlayerFishEvent], [org.bukkit.event.server.ServerEvent, MapInitializeEvent, ServerCommandEvent], [org.bukkit.event.world.WorldEvent, WorldSaveEvent, WorldInitEvent, ...], [org.bukkit.inventory.ItemStack, Inventory, DoubleChestInventory, ...], [org.bukkit.map.MapView], [org.bukkit.metadata.Metadatable], [org.bukkit.permissions.ServerOperator, Permissible], [org.bukkit.plugin.messaging.PluginMessageRecipien
t],
[org.bukkit.potion.PotionEffectType, PotionEffectTypeWrapper], [org.fusesource.hawtjni.runtime.Library], [org.fusesource.jansi.AnsiOutputStream, WindowsAnsiOutputStream, AnsiConsole, ...], [org.fusesource.jansi.internal.Kernel32, CONSOLE_SCREEN_BUFFER_INFO, COORD, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
CraftBukkit Information:
Running:
Failed to handle CraftCrashReport:
java.lang.NullPointerException
at org.bukkit.Bukkit.getName(Bukkit.java:69)
at org.bukkit.craftbukkit.v1_5_R2.CraftCrashReport.ca
ll(CraftCrashReport.java:20)
at net.minecraft.server.v1_5_R2.CrashReportSystemDeta
ils.a(SourceFile:74)
at net.minecraft.server.v1_5_R2.CrashReport.h(CrashRe
port.java:41)
at net.minecraft.server.v1_5_R2.CrashReport.<init>(Cr
ashReport.java:28)
at net.minecraft.server.v1_5_R2.MinecraftServer.run(M
inecraftServer.java:426)
at net.minecraft.server.v1_5_R2.ThreadServerApplicati
on.run(SourceFile:573)
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'craftbukkit'
Type: Dedicated Server (map_server.txt)
Merci de m'aider 
