Error in compositing video and SubtitlesClip by CompositeVideoClip

[lifeNrun]

Hi, when I try to composite video and SubtitlesClip by CompositeVideoClip,

     videoClip = VideoFileClip("test.mp4")
     font="Arial"
    color = 'black'
    generator = lambda txt: TextClip(txt, font, fontsize=36, color=color)
    subtitles = SubtitlesClip("test.srt", generator)
    finalVideo = CompositeVideoClip([videoClip, subtitles.set_pos((438, 360))])
    finalVideo.to_videofile("new.mp4", fps=24, remove_temp=True)

I got these errors Below:

[MoviePy] This command returned an error !Traceback (most recent call last):
File "C:\Python36\lib\site-packages\moviepy\video\VideoClip.py", line 1156, in init
subprocess_call(cmd, verbose=False)
File "C:\Python36\lib\site-packages\moviepy\tools.py", line 49, in subprocess_call
raise IOError(err.decode('utf8'))
OSError: convert.exe: no images defined `PNG32:C:\Users\ADMINI~1\AppData\Local\Temp\tmprov56xtu.png' @ error/convert.c/ConvertImageComman

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "testSubtitle.py", line 67:
finalVideo.to_videofile("new.mp4", fps=24, remove_temp=True)
File "C:\Python36\lib\site-packages\moviepy\tools.py", line 130, in fdepr
return f(*a, **kw)
File "", line 2, in write_videofile
File "C:\Python36\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration
return f(clip, *a, **k)
File "", line 2, in write_videofile
File "C:\Python36\lib\site-packages\moviepy\decorators.py", line 137, in use_clip_fps_by_default
return f(clip, *new_a, **new_kw)
File "", line 2, in write_videofile
File "C:\Python36\lib\site-packages\moviepy\decorators.py", line 22, in convert_masks_to_RGB
return f(clip, *a, **k)
File "C:\Python36\lib\site-packages\moviepy\video\VideoClip.py", line 326, in write_videofile
progress_bar=progress_bar)
File "C:\Python36\lib\site-packages\moviepy\video\io\ffmpeg_writer.py", line 218, in ffmpeg_write_video
fps=fps, dtype="uint8"):
File "C:\Python36\lib\site-packages\tqdm_tqdm.py", line 940, in iter
for obj in iterable:
File "C:\Python36\lib\site-packages\moviepy\Clip.py", line 475, in generator
frame = self.get_frame(t)
File "", line 2, in get_frame
File "C:\Python36\lib\site-packages\moviepy\decorators.py", line 89, in wrapper
return f(*new_a, **new_kw)
File "C:\Python36\lib\site-packages\moviepy\Clip.py", line 94, in get_frame
return self.make_frame(t)
File "C:\Python36\lib\site-packages\moviepy\video\compositing\CompositeVideoClip.py", line 112, in make_frame
f = c.blit_on(f, t)
File "C:\Python36\lib\site-packages\moviepy\video\VideoClip.py", line 543, in blit_on
img = self.get_frame(ct)
File "", line 2, in get_frame
File "C:\Python36\lib\site-packages\moviepy\decorators.py", line 89, in wrapper
return f(*new_a, **new_kw)
File "C:\Python36\lib\site-packages\moviepy\Clip.py", line 94, in get_frame
return self.make_frame(t)
File "C:\Python36\lib\site-packages\moviepy\video\tools\subtitles.py", line 75, in make_frame
sub = add_textclip_if_none(t)
File "C:\Python36\lib\site-packages\moviepy\video\tools\subtitles.py", line 70, in add_textclip_if_none
self.textclips[sub] = self.make_textclip(sub[1])
File "MusicChina.py", line 76, in
generator = lambda txt: TextClip(txt, font, fontsize=36, color=color)
File "C:\Python36\lib\site-packages\moviepy\video\VideoClip.py", line 1165, in init
raise IOError(error)
OSError: MoviePy Error: creation of simkai.ttf failed because of the following error:

convert.exe: no images defined `PNG32:C:\Users\ADMINI~1\AppData\Local\Temp\tmprov56xtu.png' @ error/convert.c/ConvertImageCommand/3258.

Thanks