应用启动错误：无法从“ importlib”导入名称“元数据”

如何解决应用启动错误：无法从“ importlib”导入名称“元数据”

在卸载和更新sklearn库后启动jupyter笔记本时出现问题 如下。

conda uninstall scikit-learn --yes
conda install scikit-learn==0.23.1

我无法通过单击jupyter笔记本启动按钮从ANACONDA NAGIGATOR启动我的jupyter笔记本。 应用程序启动错误说，

Traceback (most recent call last):
File "D:\Anaconda3\lib\site-packages\jsonschema\__init__.py",line 31,in 
from importlib import Metadata
ImportError: cannot import name 'Metadata' from 'importlib' (D:\Anaconda3\lib\importlib\__init__.py)

During handling of the above exception,another exception occurred:

Traceback (most recent call last):
File "D:\Anaconda3\Scripts\jupyter-notebook-script.py",line 6,in 
from notebook.notebookapp import main
File "D:\Anaconda3\lib\site-packages\notebook\notebookapp.py",line 85,in 
from .services.contents.manager import ContentsManager
File "D:\Anaconda3\lib\site-packages\notebook\services\contents\manager.py",line 17,in 
from nbformat import sign,validate as validate_nb,ValidationError
File "D:\Anaconda3\lib\site-packages\nbformat\__init__.py",line 32,in 
from .validator import validate,ValidationError
File "D:\Anaconda3\lib\site-packages\nbformat\validator.py",line 12,in 
from .json_compat import get_current_validator,ValidationError
File "D:\Anaconda3\lib\site-packages\nbformat\json_compat.py",line 10,in 
import jsonschema
File "D:\Anaconda3\lib\site-packages\jsonschema\__init__.py",line 33,in 
import importlib_Metadata as Metadata
ModuleNotFoundError: No module named 'importlib_Metadata'

有人知道如何解决这个问题吗？