Traceback (most recent call last):
  File "C:/Users/Stephen/Desktop/PY1/SI1.py", line 111, in <module>
    enemy.setx(x)
  File "C:\Users\Stephen\AppData\Local\Programs\Python\Python37\lib\turtle.py", line 1808, in setx
    self._goto(Vec2D(x, self._position[1]))
  File "C:\Users\Stephen\AppData\Local\Programs\Python\Python37\lib\turtle.py", line 3158, in _goto
    screen._pointlist(self.currentLineItem),
  File "C:\Users\Stephen\AppData\Local\Programs\Python\Python37\lib\turtle.py", line 755, in _pointlist
    cl = self.cv.coords(item)
  File "<string>", line 1, in coords
  File "C:\Users\Stephen\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 2469, in coords
    self.tk.call((self._w, 'coords') + args))]
_tkinter.TclError: invalid command name ".!canvas"