randomtp error

 Unhandled exception executing command 'randomtp' in plugin RandomTeleport vmaven-version-number
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
        at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:529)
        at net.minecraft.network.NetServerHandler.func_72566_d(NetServerHandler.java:1406)
        at net.minecraft.network.NetServerHandler.chat(NetServerHandler.java:1270)
        at net.minecraft.network.NetServerHandler.func_72481_a(NetServerHandler.java:1202)
        at net.minecraft.network.packet.Packet3Chat.func_73279_a(Packet3Chat.java:68)
        at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:465)
        at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:234)
        at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
        at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:37)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:906)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:773)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:655)
        at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.NullPointerException
        at com.atomic.rtp.Commands.RTPCommand.onCommand(RTPCommand.java:58)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 15 more