Solved uSkyBlock Internal Error After Set-up

So I've downloaded uSkyblock, put in a schematic, and ran it. When I tried to create an island by /is create, I got the error "An internal error occurred while attempting to perform this command." This is the error:

Code:

[19:17:49] [Server thread/INFO]: TheGoldenGoal issued server command: /is
[19:17:51] [Server thread/ERROR]: **** THIS IS NOT AN ISSUE TO DO WITH PER WORLD PLUGINS ****
Could not pass event InventoryClickEvent to uSkyBlock v2.3-HF1a
org.bukkit.event.EventException
    at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:122) ~[?:?]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at us.Myles.PWP.TransparentListeners.PWPRegisteredListener.callEvent(PWPRegisteredListener.java:30) [PerWorldPlugins.jar:?]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:1554) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.PacketPlayInWindowClick.a(SourceFile:31) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.PacketPlayInWindowClick.a(SourceFile:9) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0]
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) [?:1.7.0]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0]
    at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigot.jar:git-Spigot-8dc4297-adc129a]
    at java.lang.Thread.run(Unknown Source) [?:1.7.0]
Caused by: org.bukkit.command.CommandException: Unhandled exception executing command 'island' in plugin uSkyBlock v2.3-HF1a
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at us.Myles.PWP.FakeSimpleCommandMap.dispatch(FakeSimpleCommandMap.java:95) ~[?:?]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:642) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer.performCommand(CraftPlayer.java:245) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at us.talabrek.ultimateskyblock.SkyBlockMenu.onClick(SkyBlockMenu.java:1160) ~[?:?]
    at us.talabrek.ultimateskyblock.event.MenuEvents.guiClick(MenuEvents.java:22) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0]
    at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:120) ~[?:?]
    ... 16 more
Caused by: java.lang.NoSuchMethodError: com.sk89q.worldguard.protection.regions.ProtectedCuboidRegion.getIntersectingRegions(Ljava/util/Collection;)Ljava/util/List;
    at us.talabrek.ultimateskyblock.handler.WorldGuardHandler.isIslandIntersectingSpawn(WorldGuardHandler.java:326) ~[?:?]
    at us.talabrek.ultimateskyblock.uSkyBlock.islandInSpawn(uSkyBlock.java:842) ~[?:?]
    at us.talabrek.ultimateskyblock.uSkyBlock.getNextIslandLocation(uSkyBlock.java:1185) ~[?:?]
    at us.talabrek.ultimateskyblock.uSkyBlock.createIsland(uSkyBlock.java:1139) ~[?:?]
    at us.talabrek.ultimateskyblock.command.island.CreateCommand.doExecute(CreateCommand.java:23) ~[?:?]
    at us.talabrek.ultimateskyblock.command.island.RequirePlayerCommand.execute(RequirePlayerCommand.java:31) ~[?:?]
    at us.talabrek.ultimateskyblock.command.common.CompositeUSBCommand.execute(CompositeUSBCommand.java:116) ~[?:?]
    at us.talabrek.ultimateskyblock.command.common.AbstractCommandExecutor.onCommand(AbstractCommandExecutor.java:21) ~[?:?]
    at us.talabrek.ultimateskyblock.command.IslandCommand.onCommand(IslandCommand.java:64) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at us.Myles.PWP.FakeSimpleCommandMap.dispatch(FakeSimpleCommandMap.java:95) ~[?:?]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:642) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at org.bukkit.craftbukkit.v1_8_R1.entity.CraftPlayer.performCommand(CraftPlayer.java:245) ~[spigot.jar:git-Spigot-8dc4297-adc129a]
    at us.talabrek.ultimateskyblock.SkyBlockMenu.onClick(SkyBlockMenu.java:1160) ~[?:?]
    at us.talabrek.ultimateskyblock.event.MenuEvents.guiClick(MenuEvents.java:22) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0]
    at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:120) ~[?:?]
    ... 16 more

I have Vault and the correct version of World Guard. I use Spigot 1.8 R0.1. When I looked through the rest of the logs, uSkyBlock loaded correctly, loaded one schematic, and loaded in WorldGuard. The only error came up when I tried to run the /is create command. Any help would be greatly appreciated!

Well... I ended up having the wrong version of World Guard after all. I had installed the one I needed but it hadn't worked at first. Woops

<Edited by bwfcwalshy: Merged posts, please use the edit button rather than double posting.>