Cannot teleport error

[Phyc0]

I tried to teleport to a player who wasn't registered, and I get the error 'You cannot teleport to this player, as they've disabled people teleporting to them.'

[1/1/10] [9:59:03 PM] <+Phyc0> !players azkabar
[1/1/10] [9:59:03 PM] <&Nuweni> The requested player is not registered with Las Venturas Playground.