回溯（最后一次最新调用）：Anaconda启动时出错

Question

我正在尝试在Anaconda上启动应用程序，但出现以下应用程序启动错误：

Traceback (most recent call last):

File "C:\Users\emanu\anaconda3\Scripts\jupyter-notebook-script.py", line 6, in 
from notebook.notebookapp import main

File "C:\Users\emanu\anaconda3\lib\site-packages\notebook\__init__.py", line 27, in 
from .nbextensions import install_nbextension

File "C:\Users\emanu\anaconda3\lib\site-packages\notebook\nbextensions.py", line 26, in 
from .config_manager import BaseJSONConfigManager

File "C:\Users\emanu\anaconda3\lib\site-packages\notebook\config_manager.py", line 14, in 
from traitlets.config import LoggingConfigurable

File "C:\Users\emanu\AppData\Roaming\Python\Python38\site-packages\traitlets\__init__.py", line 1, in 
from .traitlets import *

File "C:\Users\emanu\AppData\Roaming\Python\Python38\site-packages\traitlets\traitlets.py", line 61, in 
from .utils.sentinel import Sentinel

ModuleNotFoundError: No module named 'traitlets.utils.sentinel'

我已经更新了PIP，但没有任何效果。如何解决