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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.NBTCompressedStreamTools.a(SourceFile:9) at net.minecraft.server.WorldNBTStorage.getWorldData(WorldNBTStorage.java:102) at net.minecraft.server.World.<init>(World.java:120) at net.minecraft.server.WorldServer.<init>(WorldServer.java:42) at org.bukkit.craftbukkit.CraftServer.createWorld(CraftServer.java:681) at org.bukkit.Bukkit.createWorld(Bukkit.java:155) at org.bukkit.WorldCreator.createWorld(WorldCreator.java:235) at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:399) at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:378) at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:364) at com.onarandombox.MultiverseCore.utils.WorldManager.loadWorlds(WorldManager.java:659) at com.onarandombox.MultiverseCore.MultiverseCore.onEnable(MultiverseCore.java:293) at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217) at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:365) at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381) at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:265) at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:247) at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:296) at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:275) at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:225) at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:380) at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)