[Python] gTTS Doesn't Save MP3 Files

I want to create an artificial intelligence program using Python. I found out that I need gTTS but it doesn't save mp3 files. Help me, please.

#gtts is imported
def talkToMe(audio, lgg = 'en'):
#print(audio)
tts = gTTS(text = audio, lang = lgg)
#tts.save('audio.mp3') #doesn't work
with open("audio.mp3") as fp: #doesn't work
tts.write_to_fp(fp)
os.system('mpg123\mpg123.exe audio.mp3')


Traceback (most recent call last):
File "C:\Users\zigzag\Desktop\gtts_test1\main.py", line 9, in <module>
talkToMe("hello")
File "C:\Users\zigzag\Desktop\gtts_test1\main.py", line 7, in talkToMe
tts.write_to_fp(fp)
File "B:\Python36\lib\site-packages\gtts\tts.py", line 187, in write_to_fp
part_tk = self.token.calculate_token(part)
File "B:\Python36\lib\site-packages\gtts_token\gtts_token.py", line 28, in calculate_token
seed = self._get_token_key()
File "B:\Python36\lib\site-packages\gtts_token\gtts_token.py", line 62, in _get_token_key
a = re.search("a\\\\x3d(-?\d+);", tkk_expr).group(1)
AttributeError: 'NoneType' object has no attribute 'group'

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