WorldGuard Error while enabling

[14:58:37] [Server thread/INFO]: [WorldGuard] Enabling WorldGuard v6.0.0-SNAPSHOT.1464-
[14:58:37] [Server thread/INFO]: [WorldGuard] (world) TNT ignition is PERMITTED.
[14:58:37] [Server thread/INFO]: [WorldGuard] (world) Lighters are PERMITTED.
[14:58:37] [Server thread/INFO]: [WorldGuard] (world) Lava fire is blocked.
[14:58:37] [Server thread/INFO]: [WorldGuard] (world) All fire spread is disabled.
[14:58:37] [Server thread/INFO]: [WorldGuard] Loaded configuration for world 'world'
[14:58:37] [Server thread/INFO]: [WorldGuard] (world_the_end) TNT ignition is PERMITTED.
[14:58:37] [Server thread/INFO]: [WorldGuard] (world_the_end) Lighters are PERMITTED.
[14:58:37] [Server thread/INFO]: [WorldGuard] (world_the_end) Lava fire is blocked.
[14:58:37] [Server thread/INFO]: [WorldGuard] (world_the_end) All fire spread is disabled.
[14:58:37] [Server thread/INFO]: [WorldGuard] Loaded configuration for world 'world_the_end'
[14:58:37] [Server thread/INFO]: [WorldGuard] Loading region data...
[14:58:37] [Server thread/INFO]: [WorldGuard] Unloading and saving region data that is currently loaded...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'Hauptwelt_the_end' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'Redstone' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'kldb' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'eventworld' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'Hauptwelt' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'skyworld' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'eventwelt' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'Event' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'world_the_end' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'world_nether' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'world' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'Abbau' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Migrating regions in 'Freebuild' to convert names -> UUIDs...
[14:58:37] [Server thread/INFO]: [WorldGuard] Resolving 57 name(s) into UUIDs... this may take a while.
[14:58:42] [Timer-2/INFO]: [WorldGuard] UUIDs have been found for 44 name(s)...
[14:58:43] [Server thread/INFO]: [WorldGuard] UUIDs resolved... now migrating all regions to UUIDs where possible...
[14:58:43] [Server thread/INFO]: [WorldGuard] Loading region data for loaded worlds...
[14:58:43] [Server thread/ERROR]: Error occurred while enabling WorldGuard v6.0.0-SNAPSHOT.1464- (Is it up to date?)
java.lang.NullPointerException: The world was unloaded and the reference is unavailable
	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at com.sk89q.worldedit.bukkit.BukkitWorld.getWorld(BukkitWorld.java:137) ~[?:?]
	at com.sk89q.worldedit.bukkit.BukkitWorld.getName(BukkitWorld.java:155) ~[?:?]
	at com.sk89q.worldguard.protection.flags.LocationFlag.marshal(LocationFlag.java:133) ~[?:?]
	at com.sk89q.worldguard.protection.flags.LocationFlag.marshal(LocationFlag.java:41) ~[?:?]
	at com.sk89q.worldguard.protection.managers.storage.file.YamlRegionFile.addMarshalledFlag(YamlRegionFile.java:312) ~[?:?]
	at com.sk89q.worldguard.protection.managers.storage.file.YamlRegionFile.getFlagData(YamlRegionFile.java:294) ~[?:?]
	at com.sk89q.worldguard.protection.managers.storage.file.YamlRegionFile.saveAll(YamlRegionFile.java:233) ~[?:?]
	at com.sk89q.worldguard.protection.managers.migration.UUIDMigration.migrate(UUIDMigration.java:87) ~[?:?]
	at com.sk89q.worldguard.protection.managers.migration.AbstractMigration.migrate(AbstractMigration.java:57) ~[?:?]
	at com.sk89q.worldguard.bukkit.RegionContainer.migrate(RegionContainer.java:280) ~[?:?]
	at com.sk89q.worldguard.bukkit.RegionContainer.autoMigrate(RegionContainer.java:299) ~[?:?]
	at com.sk89q.worldguard.bukkit.RegionContainer.initialize(RegionContainer.java:91) ~[?:?]
	at com.sk89q.worldguard.bukkit.WorldGuardPlugin.onEnable(WorldGuardPlugin.java:217) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:412) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:476) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:394) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.n(MinecraftServer.java:360) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.g(MinecraftServer.java:334) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.a(MinecraftServer.java:290) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:210) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]