WAT IS THIS

linky

18:34:07 [INFO] This server is running Craftbukkit version git-Bukkit-0.0.0-904-
g9277096-b953jnks (MC: 1.7.2)
18:34:08 [INFO] Preparing level "world"
18:34:08 [SEVERE] java.io.IOException: Not in GZIP format
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.readHeader(Unknown Sour
ce)
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
18:34:08 [SEVERE]       at net.minecraft.server.CompressedStreamTools.a(SourceFi
le:8)
18:34:08 [SEVERE]       at net.minecraft.server.WorldLoader.b(SourceFile:54)
18:34:08 [SEVERE]       at net.minecraft.server.WorldLoaderServer.isConvertable(
SourceFile:84)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:165)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:148)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:335)
18:34:08 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
18:34:08 [SEVERE] java.io.IOException: Not in GZIP format
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.readHeader(Unknown Sour
ce)
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
18:34:08 [SEVERE]       at net.minecraft.server.CompressedStreamTools.a(SourceFi
le:8)
18:34:08 [SEVERE]       at net.minecraft.server.PlayerNBTManager.c(SourceFile:95
)
18:34:08 [SEVERE]       at net.minecraft.server.World.<init>(World.java:118)
18:34:08 [SEVERE]       at net.minecraft.server.WorldServer.<init>(WorldServer.j
ava:27)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:180)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:148)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:335)
18:34:08 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
18:34:08 [SEVERE] java.io.IOException: Not in GZIP format
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.readHeader(Unknown Sour
ce)
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
18:34:08 [SEVERE]       at java.util.zip.GZIPInputStream.<init>(Unknown Source)
18:34:08 [SEVERE]       at net.minecraft.server.CompressedStreamTools.a(SourceFi
le:8)
18:34:08 [SEVERE]       at net.minecraft.server.PlayerNBTManager.c(SourceFile:95
)
18:34:08 [SEVERE]       at net.minecraft.server.World.<init>(World.java:118)
18:34:08 [SEVERE]       at net.minecraft.server.WorldServer.<init>(WorldServer.j
ava:27)
18:34:08 [SEVERE]       at net.minecraft.server.SecondaryWorldServer.<init>(Seco
ndaryWorldServer.java:8)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.a(MinecraftServe
r.java:210)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.init(MinecraftSe
rver.java:148)
18:34:08 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftSer
ver.java:335)
18:34:08 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(Sour
ceFile:422)
18:34:08 [INFO] Preparing start region for level 0 (Seed: -1623774494)
18:34:10 [INFO] Preparing spawn area: 0%
18:34:11 [INFO] Preparing spawn area: 89%
18:34:11 [INFO] Preparing start region for level 1 (Seed: 7831117182528298466)
18:34:12 [INFO] CommandBook 1.5.2-customized enabled.
18:34:12 [INFO] CommandBook: Maximum wrapper compatibility is enabled. Some feat
ures have been disabled to be compatible with poorly written server wrappers.
18:34:12 [INFO] CommandBook: 0 banned name(s) loaded.
18:34:12 [INFO] CommandBook: 1 kit(s) loaded.
18:34:12 [INFO] CommandBook: No known permissions plugin detected. Using configu
ration file for permissions.
18:34:12 [INFO] Permissions not detected.
18:34:12 [INFO] CraftIRC v2.0 Preview 11 loading.
18:34:12 [INFO] CraftIRC - Connecting to irc.esper.net:6667
18:34:13 [INFO] CraftIRC - Connected
18:34:13 [INFO] CraftIRC Enabled.
18:34:13 [INFO] CraftIRC DEBUG [OFF]
18:34:13 [INFO] WorldEdit 4.6 enabled.
18:34:13 [INFO] WorldEdit: No known permissions plugin detected. Using configura
tion file for permissions.
18:34:13 [INFO] CraftIRC - Joined channel: #xanadar
18:34:13 [INFO] Done (0.562s)! For help, type "help" or "?"
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