[WorldGuard] Loading WorldGuard v6.0.0-SNAPSHOT.1464-

[21:30:16] [Server thread/ERROR]: Could not pass event BlockPlaceEvent to PreciousStones v9.7.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:148) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.ItemStack.placeItem(ItemStack.java:142) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.PlayerInteractManager.interact(PlayerInteractManager.java:398) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:662) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:50) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.PacketPlayInBlockPlace.handle(PacketPlayInBlockPlace.java:86) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [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]
Caused by: java.lang.IncompatibleClassChangeError: Found interface com.sk89q.worldguard.protection.ApplicableRegionSet, but class was expected
at net.sacredlabyrinth.Phaed.PreciousStones.managers.WorldGuardManager.isWGRegion(WorldGuardManager.java:54) ~[?:?]
at net.sacredlabyrinth.Phaed.PreciousStones.listeners.PSBlockListener.placingFieldChecks(PSBlockListener.java:1423) ~[?:?]
at net.sacredlabyrinth.Phaed.PreciousStones.listeners.PSBlockListener.handlePlace(PSBlockListener.java:961) ~[?:?]
at net.sacredlabyrinth.Phaed.PreciousStones.listeners.PSBlockListener.onBlockPlace(PSBlockListener.java:794) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_65]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_65]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
... 16 more