Bukkit

i got this error when doing /Nt on my 1.8.6 spigot server with 1.8 towny

[12:13:36] [Server thread/INFO]: Icy_Eagle issued server command: /nt
[12:13:36] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'nt' in plugin NeedTown v2.7
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1135) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:970) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_45]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_45]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:60) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:718) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.lang.NullPointerException
    at me.jacklin213.needtown.NeedTown.hasTown(NeedTown.java:394) ~[?:?]
    at me.jacklin213.needtown.NeedTown.onCommand(NeedTown.java:197) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    ... 15 more
[12:13:40] [Server thread/INFO]: Icy_Eagle issued server command: /needtown
[12:13:40] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'needtown' in plugin NeedTown v2.7
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1135) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:970) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_45]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_45]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:60) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:718) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot.jar:git-Spigot-c5146ba-01930e2]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.lang.NullPointerException
    at me.jacklin213.needtown.NeedTown.hasTown(NeedTown.java:394) ~[?:?]
    at me.jacklin213.needtown.NeedTown.onCommand(NeedTown.java:197) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
    ... 15 more
[12:13:40] [User Authenticator #3/INFO]: UUID of player gervoblow is 259e268a-ff56-46d0-a9dd-544bdecf0762
[12:13:40] [Server thread/INFO]: gervoblow[/73.49.110.250:52431] logged in with entity id 13144 at ([Spawn]261.7611967545835, 15.737329046984124, 411.3923801114778)