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# Dungeon Game Type Error

I keep getting the type error, TypeError: can only join an iterable, in my join method in the while loop.

```import random
import os

#draw grib
#pick random location for player
#pick random location for exit door
#pick random locaton for monster
#draw player in the grid
#take input for movement
#move the player, unless invalid move (past edges of grid)
#check for win or loss
#clear screen and redraw grid

CELLS = [(0,0),(1,0),(2,0),(3,0),(4,0),
(0,1),(1,1),(2,1),(3,1),(4,1),
(0,2),(1,2),(2,2),(3,2),(4,2),
(0,3),(1,3),(2,3),(3,3),(4,3),
(0,4),(1,4),(2,4),(3,4),(4,4)
]

def get_locations():
return random.sample(CELLS,3)

def move_player(player,move):
#Get the player's location
#If move == LEFT, x-1
#If move == RIGHT, x+1
#If move == UP, y-1
#If move == DOWN, y+1
return player

def get_moves(player):
x,y=player
moves = ["LEFT","RIGHT","UP","DOWN"]
if x == 0:
moves.remove("LEFT")
if x == 4:
moves.remove("RIGHT")
if y == 0:
moves.remove("UP")
if y == 4:
moves.remove("DOWN")

#If player's y == 0, they can't move up
#If player's y == 4, they can't move down

def clear_screen():
os.system('cls' if os.name == 'nt' else 'clear')

moster, door, player = get_locations()

while True:
valid_moves = get_moves(player)
print("Welcome to the dungeon")
print("You're currently in {}".format(player))
print("You can move {}".format(", ".join(valid_moves)))
print("Enter QUIT to quit")

move = input("> ")
move = move.upper()

if move == "QUIT":
break
#Good move? Change the player postition