Group manager prefix/suffix isnt working!

I don't know what I am doing wrong, I am doing /mangaddv Owner prefix &0[&4Owner&0] for example and nothing happens. I have essentials chat, groupmanager, vault. I got this error here

2016-09-13 14-19
=============================== GM ERROR LOG ===============================
= ERROR REPORT START - Pre2.14.1.3 FINAL (Phoenix) =

java.lang.NullPointerException
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:211)
at org.anjocaido.groupmanager.GroupManager.onCommand(GroupManager.java:1827)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140)
at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:625)
at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1299)
at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1159)
at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:37)
at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:9)
at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)
at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:690)
at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:360)
at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:646)
at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:550)
at java.lang.Thread.run(Unknown Source)

============================================================================

2016-09-13 14-23
=============================== GM ERROR LOG ===============================
= ERROR REPORT START - Pre2.14.1.3 FINAL (Phoenix) =

java.lang.NullPointerException
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:211)
at org.anjocaido.groupmanager.GroupManager.onCommand(GroupManager.java:1827)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140)
at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:625)
at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1299)
at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1159)
at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:37)
at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:9)
at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)
at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:690)
at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:360)
at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:646)
at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:550)
at java.lang.Thread.run(Unknown Source)

============================================================================

2016-09-13 14-27
=============================== GM ERROR LOG ===============================
= ERROR REPORT START - Pre2.14.1.3 FINAL (Phoenix) =

java.lang.NullPointerException
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:211)
at org.anjocaido.groupmanager.GroupManager.onCommand(GroupManager.java:1827)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140)
at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:625)
at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1299)
at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1159)
at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:37)
at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:9)
at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)
at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:690)
at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:360)
at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:646)
at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:550)
at java.lang.Thread.run(Unknown Source)

============================================================================

 

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