[01:34:41] [Server thread/ERROR]: Could not pass event PlayerInteractEntityEvent to Duel v0.2.0-SNAPSHOT-b201
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-952179b-f98775c]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-952179b-f98775c]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-952179b-f98775c]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:1268) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.PacketPlayInUseEntity.a(SourceFile:52) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.PacketPlayInUseEntity.a(SourceFile:11) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot.jar:git-Spigot-952179b-f98775c]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_25]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_25]
    at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:685) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigot.jar:git-Spigot-952179b-f98775c]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigot.jar:git-Spigot-952179b-f98775c]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
Caused by: java.lang.IncompatibleClassChangeError: Found interface com.sk89q.worldguard.protection.ApplicableRegionSet, but class was expected
    at com.me.tft_02.duel.util.RegionUtils.getRegion(RegionUtils.java:60) ~[?:?]
    at com.me.tft_02.duel.util.RegionUtils.canDuelHereWG(RegionUtils.java:22) ~[?:?]
    at com.me.tft_02.duel.util.player.DuelManager.canDuel(DuelManager.java:65) ~[?:?]
    at com.me.tft_02.duel.util.player.DuelManager.canDuel(DuelManager.java:32) ~[?:?]
    at com.me.tft_02.duel.listeners.PlayerListener.onPlayerInteract(PlayerListener.java:57) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_25]
    at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_25]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot.jar:git-Spigot-952179b-f98775c]
    ... 14 more