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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.NBTCompressedStreamTools.a(SourceFile:9)	at net.minecraft.server.WorldLoader.c(SourceFile:65)	at net.minecraft.server.WorldLoaderServer.isConvertable(SourceFile:95)	at org.bukkit.craftbukkit.CraftServer.createWorld(CraftServer.java:663)	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)