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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.<init>(Unknown Source) at java.util.zip.GZIPInputStream.<init>(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.<init>(World.java:160) at net.minecraft.server.v1_6_R3.WorldServer.<init>(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)