[12:23:18 INFO]: HansAnonymous issued server command: /ultimatecore convert
[12:23:18 INFO]: [UC] Importing Jails...
[12:23:18 INFO]: [UC] Importing Warps...
[12:23:18 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'ultimatecore' in plugin UltimateCore v2.1.21
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[server.jar:git-Spigot-c55900f-9af379f]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[server.jar:git-Spigot-c55900f-9af379f]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1351) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1186) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Spigot-c55900f-9af379f]
        at java.util.concurrent.Executors$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_10_R1.SystemUtils.a(SourceFile:45) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:733) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:399) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:672) [server.jar:git-Spigot-c55900f-9af379f]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:571) [server.jar:git-Spigot-c55900f-9af379f]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_92]
Caused by: java.lang.NoClassDefFoundError: com/earth2me/essentials/spawn/IEssentialsSpawn
        at bammerbom.ultimatecore.bukkit.commands.CmdUltimatecore.run(CmdUltimatecore.java:170) ~[?:?]
        at bammerbom.ultimatecore.bukkit.UltimateCommands.onCmd(UltimateCommands.java:213) ~[?:?]
        at bammerbom.ultimatecore.bukkit.UltimateCore.onCommand(UltimateCore.java:172) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Spigot-c55900f-9af379f]
        ... 15 more