Bukkit

So I'm running a server in 1.11. If I try to do the command /cityworld. The command fails and it says internal error occurred while attempting to perform this command. Please help. Here is console.

[18:32:46 INFO]: DiamondDonuts issued server command: /cityworld
[18:32:46 INFO]: Preparing start region for level 4 (Seed: -2107820491992661720)
[18:32:46 INFO]: [CityWorld][PasteProvider] Found WorldEdit v6.1.5;4651611, enabling its schematics
[18:32:46 INFO]: [CityWorld][WorldEdit] Loaded 0 schematic(s) for world CityWorld
[18:32:47 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'cityworld' in plugin CityWorld v2.992
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[minecraft_server.jar:git-Bukkit-a552117]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[minecraft_server.jar:git-Bukkit-a552117]
at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:629) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerConnection.java:1285) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1145) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(SourceFile:37) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(SourceFile:9) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Bukkit-a552117]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_92]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_92]
at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:695) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:360) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:650) [minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:554) [minecraft_server.jar:git-Bukkit-a552117]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_92]
Caused by: net.minecraft.server.v1_11_R1.ReportedException: Exception generating new chunk
at net.minecraft.server.v1_11_R1.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:167) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:140) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:120) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:116) ~[minecraft_server.jar:git-Bukkit-a552117]
at org.bukkit.craftbukkit.v1_11_R1.CraftServer.createWorld(CraftServer.java:917) ~[minecraft_server.jar:git-Bukkit-a552117]
at me.daddychurchill.CityWorld.CommandCityWorld.getDefaultCityWorld(CommandCityWorld.java:140) ~[?:?]
at me.daddychurchill.CityWorld.CommandCityWorld.onCommand(CommandCityWorld.java:92) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[minecraft_server.jar:git-Bukkit-a552117]
... 15 more
Caused by: java.lang.NoSuchFieldError: BEACH
at me.daddychurchill.CityWorld.Plugins.ShapeProvider_Normal.preGenerateChunk(ShapeProvider_Normal.java:220) ~[?:?]
at me.daddychurchill.CityWorld.Plats.PlatLot.generateChunk(PlatLot.java:121) ~[?:?]
at me.daddychurchill.CityWorld.Support.PlatMap.generateChunk(PlatMap.java:80) ~[?:?]
at me.daddychurchill.CityWorld.WorldGenerator.generateBlockSections(WorldGenerator.java:214) ~[?:?]
at org.bukkit.craftbukkit.v1_11_R1.generator.CustomChunkGenerator.getOrCreateChunk(CustomChunkGenerator.java:105) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.originalGetChunkAt(ChunkProviderServer.java:159) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:140) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:120) ~[minecraft_server.jar:git-Bukkit-a552117]
at net.minecraft.server.v1_11_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:116) ~[minecraft_server.jar:git-Bukkit-a552117]
at org.bukkit.craftbukkit.v1_11_R1.CraftServer.createWorld(CraftServer.java:917) ~[minecraft_server.jar:git-Bukkit-a552117]
at me.daddychurchill.CityWorld.CommandCityWorld.getDefaultCityWorld(CommandCityWorld.java:140) ~[?:?]
at me.daddychurchill.CityWorld.CommandCityWorld.onCommand(CommandCityWorld.java:92) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[minecraft_server.jar:git-Bukkit-a552117]
... 15 more