wg error

[15:07:56] [Server thread/INFO]: [WorldGuard] Enabling WorldGuard v6.0.0-SNAPSHOT.1471-
[15:07:56] [Server thread/ERROR]: Error occurred while enabling WorldGuard v6.0.0-SNAPSHOT.1471- (Is it up to date?)
java.lang.NoSuchMethodError: com.google.common.cache.CacheBuilder.maximumSize(I)Lcom/google/common/cache/CacheBuilder;
	at com.sk89q.worldguard.blacklist.Blacklist.<init>(Blacklist.java:53) ~[?:?]
	at com.sk89q.worldguard.bukkit.BukkitBlacklist.<init>(BukkitBlacklist.java:31) ~[?:?]
	at com.sk89q.worldguard.bukkit.WorldConfiguration.loadConfiguration(WorldConfiguration.java:518) ~[?:?]
	at com.sk89q.worldguard.bukkit.WorldConfiguration.<init>(WorldConfiguration.java:211) ~[?:?]
	at com.sk89q.worldguard.bukkit.ConfigurationManager.get(ConfigurationManager.java:235) ~[?:?]
	at com.sk89q.worldguard.bukkit.ConfigurationManager.load(ConfigurationManager.java:202) ~[?:?]
	at com.sk89q.worldguard.bukkit.WorldGuardPlugin.onEnable(WorldGuardPlugin.java:200) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[custom.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) [custom.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [custom.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:352) [custom.jar:git-Spigot-b8f6402-a646500]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:313) [custom.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:402) [custom.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:370) [custom.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:325) [custom.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:211) [custom.jar:git-Spigot-b8f6402-a646500]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:494) [custom.jar:git-Spigot-b8f6402-a646500]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_45]