Some error

[zhang-mu-zhi]

when I run the code of forwaerd.py.There is some error

> [[0.3459628224372864, -0.11333124339580536, 0.9675822257995605, 0.0], [-0.12723304331302643, 0.01251344382762909, 0.9417054057121277, 1.0], [-1.7394113540649414, -0.0037579028867185116, -0.03742053359746933, 1.0], [-2.201016664505005, -0.1367340236902237, -0.09609729051589966, 0.0]]
> Traceback (most recent call last):
>   File "forward.py", line 409, in <module>
>     controller(teach_map, camera1)
>   File "forward.py", line 41, in __init__
>     self.move_init(self.start_position)
>   File "forward.py", line 49, in move_init
>     closest_point,idx = self.closest_to_teach(new_position)
>   File "forward.py", line 73, in closest_to_teach
>     closest_point=self.path1[idx+50]
> IndexError: list index out of range

How can i deal with this?
Thank you very much