[00:19:40] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mv' in plugin Multiverse-Core v2.5-b719
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_144]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_144]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R1/TileEntity
	at org.tilegames.hexicube.bukkit.isle.ChunkGen.getDefaultPopulators(ChunkGen.java:61) ~[?:?]
	at net.minecraft.server.v1_8_R3.WorldServer.b(WorldServer.java:116) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.createWorld(CraftServer.java:888) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.Bukkit.createWorld(Bukkit.java:464) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.WorldCreator.createWorld(WorldCreator.java:261) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:466) ~[?:?]
	at com.onarandombox.MultiverseCore.utils.WorldManager.addWorld(WorldManager.java:268) ~[?:?]
	at com.onarandombox.MultiverseCore.commands.CreateCommand.runCommand(CreateCommand.java:114) ~[?:?]
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.checkAndRunCommand(CommandHandler.java:279) ~[?:?]
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.processFoundCommands(CommandHandler.java:143) ~[?:?]
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.locateAndRunCommand(CommandHandler.java:93) ~[?:?]
	at com.onarandombox.MultiverseCore.MultiverseCore.onCommand(MultiverseCore.java:916) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	... 15 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R1.TileEntity
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_144]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_144]
	at org.tilegames.hexicube.bukkit.isle.ChunkGen.getDefaultPopulators(ChunkGen.java:61) ~[?:?]
	at net.minecraft.server.v1_8_R3.WorldServer.b(WorldServer.java:116) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.createWorld(CraftServer.java:888) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.Bukkit.createWorld(Bukkit.java:464) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.WorldCreator.createWorld(WorldCreator.java:261) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:466) ~[?:?]
	at com.onarandombox.MultiverseCore.utils.WorldManager.addWorld(WorldManager.java:268) ~[?:?]
	at com.onarandombox.MultiverseCore.commands.CreateCommand.runCommand(CreateCommand.java:114) ~[?:?]
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.checkAndRunCommand(CommandHandler.java:279) ~[?:?]
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.processFoundCommands(CommandHandler.java:143) ~[?:?]
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.locateAndRunCommand(CommandHandler.java:93) ~[?:?]
	at com.onarandombox.MultiverseCore.MultiverseCore.onCommand(MultiverseCore.java:916) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
	... 15 more