Bukkit

What version of RandomTP are you running on?
4.0.0

What is the expected output?
A random teleport.

What do you see instead?
"An internal error occurred while attempting to perform this command"

Do you have an error log of what happened?

Quote:

[22:41:05 INFO]: <player> issued server command: /randomteleport:randomtp
[22:41:05 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'randomteleport:randomtp' in plugin RandomTeleport vmaven-version-number
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) [spigot.jar:git-Spigot-1487]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) [spigot.jar:git-Spigot-1487]
at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:726) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:999) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:830) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:180) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:720) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489) [spigot.jar:git-Spigot-1487]
at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1487]
Caused by: java.lang.NullPointerException
at org.bukkit.Location.getBlock(Location.java:82) [spigot.jar:git-Spigot-1487]
at com.atomic.rtp.Handlers.TeleportHandler.safeize(TeleportHandler.java:78) [?:?]
at com.atomic.rtp.Handlers.TeleportHandler.getLocation(TeleportHandler.java:71) [?:?]
at com.atomic.rtp.Handlers.TeleportHandler.teleport(TeleportHandler.java:38) [?:?]
at com.atomic.rtp.Commands.RTPCommand.onCommand(RTPCommand.java:85) [?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [spigot.jar:git-Spigot-1487]
... 13 more

Please provide any additional information below.
Sign still works, just not the command

It may be a possibility that you need to update or downgrade your spigot.jar, here is a short version of your error below

[spigot.jar:git-Spigot-1487]

As you look in your error most of it is todo with spigot or you may need to update java.