我试图使用我的麦克风在python中创建文本到语音模块，但是当我运行程序时，它抛出错误。下面是我的代码：

import pyttsx3
import speech_recognition as sr
import webbrowser
import datetime
import pyjokes

def sptext():
    # Create a recognizer instance
    recognizer = sr.Recognizer()

    # Use the default microphone as the audio source
    with sr.Microphone() as source:
        print("Listening...")

        try:
            # Adjust for ambient noise before listening
            recognizer.adjust_for_ambient_noise(source)

            audio = recognizer.listen(source)

            # Use Google Speech Recognition to transcribe the audio to text
            text = recognizer.recognize_google(audio)
            print(f"You said: {text}")
        except sr.UnknownValueError:
            print("Sorry, I could not understand what you said.")
        except sr.RequestError as e:
            print(f"Request error: {e}")
        
        try:
            # Close the audio stream
            source.stream.close()
        except AttributeError:
            pass

sptext()

我得到的错误是

During handling of the above exception, another exception occurred:   

Traceback (most recent call last):  File "C:\computer_science\Python Lessons\Projects\7-Voice Assitant\ch1\main.py", line 68, in <module>
    sptext()  File "C:\computer_science\Python Lessons\Projects\7-Voice Assitant\ch1\main.py", line 44, in sptext
    with sr.Microphone() as source:
  File "C:\Users\Asus\AppData\Roaming\Python\Python311\site-packages\speech_recognition\__init__.py", line 189, in __exit__
    self.stream.close()
    ^^^^^^^^^^^^^^^^^AttributeError: 'NoneType' object has no attribute 'close'

尝试使用speechRecognition模块在Python中创建一个语音到文本项目，但不知何故，我不知道我的代码有什么问题？