wesv Error

[2014-07-27 10:44:27] [Server thread/WARN]: [WorldEditSelectionVisualizer] Task #1087791 for WorldEditSelectionVisualizer v1.3 generated an exception
java.lang.NoSuchMethodError: com.sk89q.worldedit.regions.Region.getWorld()Lcom/sk89q/worldedit/LocalWorld;
        at com.rojel.wesv.WorldEditSelectionVisualizer.compareRegion(WorldEditSelectionVisualizer.java:364) ~[?:?]
        at com.rojel.wesv.WorldEditSelectionVisualizer$1.run(WorldEditSelectionVisualizer.java:93) ~[?:?]
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-1562]
        at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:346) [spigot.jar:git-Spigot-1562]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:638) [spigot.jar:git-Spigot-1562]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1562]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1562]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1562]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1562]