I am a error in my Python code : Right now I'm doing a easy videogame in Python using the libraty Turtle but this error appeared and I don't know how to solve it.

the error is:

Any suggestions? 

My code is here: 

pastebin.com/wu5jM0gT

error:

    Traceback (most recent call last):
    File "C:/Users/ricar/PycharmProjects/Juego/Juego.py", line 122, in <module>
    objetivo.movimiento()
    File "C:/Users/ricar/PycharmProjects/Juego/Juego.py", line 91, in movimiento
    self.forward(self.speed)
    File "C:\Python27\lib\lib-tk\turtle.py", line 1553, in forward
    self._go(distance)
    File "C:\Python27\lib\lib-tk\turtle.py", line 1520, in _go
    ende = self._position + self._orient * distance
    File "C:\Python27\lib\lib-tk\turtle.py", line 277, in __mul__
    return Vec2D(self[0]*other, self[1]*other)
    TypeError: unsupported operand type(s) for *: 'float' and 'instancemethod'`
    