Problem z ustalaniem zmiennej

Siemka wszystkim, otóż mam pewien problem ze skryptem na losowe tp.

Kod tego skryptu to 

on first join:
    rtp(player)
on respawn:
    rtp(player)
 
on bed enter:
    if player has permission "vip.home":
        send "&7Twoj dom zostal zapisany"
        set {rtp::%Player%} to location at event-block
 
function rtp(gracz: player):
    if {_gracz} has permission "vip.home":
        if block at {rtp::_gracz} is bed block:
            teleport {_gracz} to {rtp::_gracz}
            stop
        else:
            set {_gtp} to false
            loop 1000 times:
                set {_x} to random integer between 0 and 1000
                set {_y} to random integer between 30 and 250
                set {_z} to random integer between 0 and 1000
                set {_tp} to location at {_x}, {_y}, {_z}
                if block at {_tp} is air:
                    if block under {_tp} is not air or water or stone or 9 or 8:
                        teleport {_gracz} to {_tp}
                        exit loop
    else:
        set {_gtp} to false
        loop 1000 times:
            set {_x} to random integer between 0 and 1000
            set {_y} to random integer between 30 and 250
            set {_z} to random integer between 0 and 1000
            set {_tp} to location at {_x}, {_y}, {_z}
            if block at {_tp} is air:
                if block under {_tp} is not air or water or stone or 9 or 8:
                    teleport {_gracz} to {_tp}
                    exit loop

Skrypt nie może pobrać zmiennych {_x} {_y} {_z} to zmiennej {_tp}. Błąd

{_tp} can only be set to one object, not more (rtp.sk, line 22: set {_tp} to location at {_x}, {_y}, {_z}')

Każda odpowiedź jest nagradzana należytym lajkiem.

Pozdrawiam