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java.util.zip.ZipException: Not in GZIP format	at java.util.zip.GZIPInputStream.readHeader(Unknown Source)	at java.util.zip.GZIPInputStream.(Unknown Source)	at java.util.zip.GZIPInputStream.(Unknown Source)	at net.minecraft.server.v1_6_R3.NBTCompressedStreamTools.a(SourceFile:9)	at net.minecraft.server.v1_6_R3.WorldMapCollection.get(SourceFile:46)	at net.minecraft.server.v1_6_R3.World.(World.java:160)	at net.minecraft.server.v1_6_R3.WorldServer.(WorldServer.java:46)	at net.minecraft.server.v1_6_R3.MinecraftServer.a(MinecraftServer.java:192)	at net.minecraft.server.v1_6_R3.DedicatedServer.init(DedicatedServer.java:152)	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:393)	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)