PlotMe Error

[16:58:25] [Server thread/ERROR]: Could not pass event PlayerMoveEvent to PlotMe v0.13f
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-d5bf866-917e46a]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-d5bf866-917e46a]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:255) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.PacketPlayInFlying.a(SourceFile:126) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.PacketPlayInPositionLook.a(SourceFile:18) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_67]
	at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_67]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigot.jar:git-Spigot-d5bf866-917e46a]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_67]
Caused by: java.lang.NoSuchMethodError: com.sk89q.worldedit.LocalSession.getMask()Lcom/sk89q/worldedit/masks/Mask;
	at com.worldcretornica.plotme.PlotWorldEdit.setMask(PlotWorldEdit.java:61) ~[?:?]
	at com.worldcretornica.plotme.PlotWorldEdit.setMask(PlotWorldEdit.java:18) ~[?:?]
	at com.worldcretornica.plotme.listener.PlotWorldEditListener.onPlayerMove(PlotWorldEditListener.java:63) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor45.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_67]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_67]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot.jar:git-Spigot-d5bf866-917e46a]
	... 14 more