Python Error

Hi Guys

I have a python script that takes a video file called video.mp4 and cuts it down based on sound activity. See below. The python script is saved as PythonVideo.py in directory C:\Users\user\Desktop\Video

import numpy as np # for numerical operations
from moviepy.editor import VideoFileClip, concatenate

clip = VideoFileClip("video.mp4")
cut = lambda i: clip.audio.subclip(i,i+1).to_soundarray(fps=22000) 
volume = lambda array: np.sqrt(((1.0*array)**2).mean())
volumes = [volume(cut(i)) for i in range(0,int(clip.duration-1))]

increases = np.diff(averaged_volumes)[:-1]>=0
decreases = np.diff(averaged_volumes)[1:]<=0
peaks_times = (increases * decreases).nonzero()[0]
peaks_vols = averaged_volumes[peaks_times]
peaks_times = peaks_times[peaks_vols>np.percentile(peaks_vols,90)]

final_times=[peaks_times[0]]
for t in peaks_times:
    if (t - final_times[-1]) < 60:
        if averaged_volumes[t] > averaged_volumes[final_times[-1]]:
            final_times[-1] = t
    else:
        final_times.append(t)

final = concatenate([clip.subclip(max(t-5,0),min(t+5, clip.duration))
                     for t in final_times])
final.to_videofile('video1.mp4') # low quality is the default 

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The issue here is when I run PythonVideo.py I get lines of error, see below. Is there something wrong I'm doing here? The python version I'm using 3.6.6

Traceback (most recent call last):
  File "C:\Users\user\Desktop\Video\PythonVideo.py", line 7, in <module>
    volumes = [volume(cut(i)) for i in range(0,int(clip.duration-1))]
  File "C:\Users\user\Desktop\Video\PythonVideo.py", line 7, in <listcomp>
    volumes = [volume(cut(i)) for i in range(0,int(clip.duration-1))]
  File "C:\Users\user\Desktop\Video\PythonVideo.py", line 5, in <lambda>
    cut = lambda i: clip.audio.subclip(i,i+1).to_soundarray(fps=22000)
  File "<C:\Program Files\Python36\lib\site-packages\decorator.py:decorator-gen-72>", line 2, in to_soundarray
  File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
    return f(clip, *a, **k)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\AudioClip.py", line 126, in to_soundarray
    snd_array = self.get_frame(tt)
  File "<C:\Program Files\Python36\lib\site-packages\decorator.py:decorator-gen-10>", line 2, in get_frame
  File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 89, in wrapper
    return f(*new_a, **new_kw)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\Clip.py", line 95, in get_frame
    return self.make_frame(t)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\Clip.py", line 138, in <lambda>
    newclip = self.set_make_frame(lambda t: fun(self.get_frame, t))
  File "C:\Program Files\Python36\lib\site-packages\moviepy\Clip.py", line 190, in <lambda>
    return self.fl(lambda gf, t: gf(t_func(t)), apply_to,
  File "<C:\Program Files\Python36\lib\site-packages\decorator.py:decorator-gen-10>", line 2, in get_frame
  File "C:\Program Files\Python36\lib\site-packages\moviepy\decorators.py", line 89, in wrapper
    return f(*new_a, **new_kw)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\Clip.py", line 95, in get_frame
    return self.make_frame(t)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\AudioFileClip.py", line 78, in <lambda>
    self.make_frame = lambda t: self.reader.get_frame(t)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\readers.py", line 184, in get_frame
    self.buffer_around(fr_max)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\readers.py", line 238, in buffer_around
    array = self.read_chunk(chunksize)
  File "C:\Program Files\Python36\lib\site-packages\moviepy\audio\io\readers.py", line 112, in read_chunk
    s = self.proc.stdout.read(L)
AttributeError: 'NoneType' object has no attribute 'stdout'

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Any help is greatly appreciated.