Server help!

Hello. The popwer just reciently went out where i live and shut down my pc, whenever i try to start my Server, i get this error

Code:

151 recipes
16 achievements
22:55:19 [INFO] Starting minecraft server version Beta 1.7.3
22:55:19 [INFO] Loading properties
22:55:19 [INFO] Starting Minecraft server on *:25565
22:55:19 [INFO] This server is running Craftbukkit version git-Bukkit-0.0.0-945-
g73697a4-b1000jnks (MC: 1.7.3)
22:55:20 [INFO] Preparing level "Normal"
22:55:20 [SEVERE] java.io.IOException: Not in GZIP format
22:55:20 [SEVERE]       at java.util.zip.GZIPInputStream.readHeader(Unknown Sour
ce)
22:55:20 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
22:55:20 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
22:55:20 [SEVERE]       at net.minecraft.server.CompressedStreamTools.a(SourceFi
le:8)
22:55:20 [SEVERE]       at net.minecraft.server.WorldLoader.b(SourceFile:54)
22:55:20 [SEVERE]       at net.minecraft.server.WorldLoaderServer.isConvertable(
SourceFile:84)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:165)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:148)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:335)
22:55:20 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
22:55:20 [SEVERE] java.io.IOException: Not in GZIP format
22:55:20 [SEVERE]       at java.util.zip.GZIPInputStream.readHeader(Unknown Sour
ce)
22:55:20 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
22:55:20 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
22:55:20 [SEVERE]       at net.minecraft.server.CompressedStreamTools.a(SourceFi
le:8)
22:55:20 [SEVERE]       at net.minecraft.server.PlayerNBTManager.c(PlayerNBTMana
ger.java:93)
22:55:20 [SEVERE]       at net.minecraft.server.World.<init>(World.java:120)
22:55:20 [SEVERE]       at net.minecraft.server.WorldServer.<init>(WorldServer.j
ava:27)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:180)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:148)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:335)
22:55:20 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
22:55:20 [SEVERE] java.lang.NullPointerException
22:55:20 [SEVERE]       at net.minecraft.server.WorldServer.c(WorldServer.java:1
06)
22:55:20 [SEVERE]       at net.minecraft.server.World.a(World.java:2063)
22:55:20 [SEVERE]       at net.minecraft.server.Chunk.addEntities(Chunk.java:470
)
22:55:20 [SEVERE]       at net.minecraft.server.ChunkProviderServer.getChunkAt(C
hunkProviderServer.java:79)
22:55:20 [SEVERE]       at net.minecraft.server.ChunkProviderServer.getOrCreateC
hunk(ChunkProviderServer.java:118)
22:55:20 [SEVERE]       at net.minecraft.server.World.getChunkAt(World.java:274)

22:55:20 [SEVERE]       at net.minecraft.server.World.getTypeId(World.java:221)
22:55:20 [SEVERE]       at net.minecraft.server.World.isEmpty(World.java:225)
22:55:20 [SEVERE]       at net.minecraft.server.World.a(World.java:192)
22:55:20 [SEVERE]       at net.minecraft.server.WorldProvider.canSpawn(SourceFil
e:51)
22:55:20 [SEVERE]       at net.minecraft.server.World.canSpawn(World.java:97)
22:55:20 [SEVERE]       at net.minecraft.server.World.c(World.java:180)
22:55:20 [SEVERE]       at net.minecraft.server.World.<init>(World.java:142)
22:55:20 [SEVERE]       at net.minecraft.server.WorldServer.<init>(WorldServer.j
ava:27)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:180)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:148)
22:55:20 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:335)
22:55:20 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
22:55:20 [SEVERE] Unexpected exception
java.lang.NullPointerException
        at net.minecraft.server.WorldServer.c(WorldServer.java:106)
        at net.minecraft.server.World.a(World.java:2063)
        at net.minecraft.server.Chunk.addEntities(Chunk.java:470)
        at net.minecraft.server.ChunkProviderServer.getChunkAt(ChunkProviderServ
er.java:79)
        at net.minecraft.server.ChunkProviderServer.getOrCreateChunk(ChunkProvid
erServer.java:118)
        at net.minecraft.server.World.getChunkAt(World.java:274)
        at net.minecraft.server.World.getTypeId(World.java:221)
        at net.minecraft.server.World.isEmpty(World.java:225)
        at net.minecraft.server.World.a(World.java:192)
        at net.minecraft.server.WorldProvider.canSpawn(SourceFile:51)
        at net.minecraft.server.World.canSpawn(World.java:97)
        at net.minecraft.server.World.c(World.java:180)
        at net.minecraft.server.World.<init>(World.java:142)
        at net.minecraft.server.WorldServer.<init>(WorldServer.java:27)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:180)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:148)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:335)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
>

Please Help! Also if there is a way to fix this WITHOUT deleting my world, i woudd be very happy.

 

try using Chunkster to fix your world, because it is corrupted.

 

make sure to run the stop command do not just close the window. if that doesn't work then run chunkster or MCEdits repair tool