Erreur terminator turtle

from turtle import *

def triangleEqui(cote):
    shape('turtle')
    for loop in range(3):
        forward (cote)
        left(120)
    exitonclick()

def carre(cote):
    shape('turtle')
    for loop in range(4):
        forward(cote)
        left(90)
    exitonclick()
    
def hexagone(cote):
    shape('turtle')
    for loop in range(6):
        forward(cote)
        left(60)
    exitonclick()

def etoile(cote):
    shape('turtle')
    for loop in range(30):
        forward(cote)
        left(170)
    exitonclick()

def lignetrig(cote):
    shape('turtle')
    for loop in range(5):
        for loop in range (3):
             forward(cote)
             left(120)
        forward(cote)
    exitonclick()

def lignecarre(cote):
    shape('turtle')
    for loop in range(5):
        for loop in range (4):
             forward(cote)
             left(90)
        forward(cote)
    exitonclick()

i=1
while i==1:
    nbForme = int(input("Entrez un nombre\n1 pour un triangle\n2 pour une ligne triangle\n3 pour un carré\n4 pour une ligne de carré\n5 pour une etoile\n6 si vous voulez quitter le programme\n"))
    
    if nbForme == 1:
        triangleEqui(100)
    elif nbForme == 2:
        lignetrig(70)
    elif nbForme == 3:
        carre(100)
    elif nbForme == 4:
        lignecarre(50)    
    elif nbForme == 5:
        etoile(200)    
    elif nbForme == 6:
        i=2

Traceback (most recent call last):

  File "<string>", line 8, in forward

  File "C:\Users\Elève\AppData\Local\Programs\Spyder\pkgs\turtle.py", line 1637, in forward
    self._go(distance)

  File "C:\Users\Elève\AppData\Local\Programs\Spyder\pkgs\turtle.py", line 1605, in _go
    self._goto(ende)

  File "C:\Users\Elève\AppData\Local\Programs\Spyder\pkgs\turtle.py", line 3178, in _goto
    self._pencolor, self._pensize, top)

  File "C:\Users\Elève\AppData\Local\Programs\Spyder\pkgs\turtle.py", line 545, in _drawline
    self.cv.coords(lineitem, *cl)

  File "<string>", line 1, in coords

  File "C:\Users\Elève\AppData\Local\Programs\Spyder\pkgs\tkinter\__init__.py", line 2469, in coords
    self.tk.call((self._w, 'coords') + args))]

TclError: invalid command name ".!canvas"


During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "C:\Users\Elève\nbForme.py", line 86, in <module>
    lignecarre(50)

  File "C:\Users\Elève\nbForme.py", line 57, in lignecarre
    forward(cote)

  File "<string>", line 12, in forward

Terminator