org.bukkit.command.CommandException: Unhandled exception executing command 'manpromote' in plugin GroupManager v1.9 (2.9.1) (Phoenix)

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org.bukkit.command.CommandException: Unhandled exception executing command 'manpromote' in plugin GroupManager v1.9 (2.9.1) (Phoenix)	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:479)	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)Caused by: java.lang.NullPointerException	at org.anjocaido.groupmanager.GroupManager.onCommand(GroupManager.java:304)	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)	... 12 more