我正在学习 anaconda，最初一切都很好，但现在 jupyter 笔记本无法工作，我很震惊，请帮助我尝试重新安装，我得到的每种方法都不起作用。下面是我收到的错误消息
Traceback (most recent call last):
File "C:\Users\Admin\anaconda3\Lib\site-packages\notebook\traittypes.py", line 235, in _resolve_classes
klass = self._resolve_string(klass)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Admin\AppData\Roaming\Python\Python311\site-packages\traitlets\traitlets.py", line 2009, in _resolve_string
return import_item(string)
^^^^^^^^^^^^^^^^^^^
File "C:\Users\Admin\AppData\Roaming\Python\Python311\site-packages\traitlets\utils\importstring.py", line 30, in import_item
module = __import__(package, fromlist=[obj])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'jupyter_server.contents'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Admin\anaconda3\Scripts\jupyter-notebook-script.py", line 10, in
sys.exit(main())
^^^^^^
File "C:\Users\Admin\anaconda3\Lib\site-packages\jupyter_core\application.py", line 277, in launch_instance
return super().launch_instance(argv=argv, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Admin\AppData\Roaming\Python\Python311\site-packages\traitlets\config\application.py", line 1044, in …我一直在尝试在 google colab 上运行这个单元格，但每次它都说“listdir”未定义。在运行此单元之前，我已在前一个单元中导入了“os”。任何人都可以帮忙找到这里的错误吗？
images = [(train_image_dir+f) for f in listdir(train_image_dir) if isfile(join(train_image_dir, f))]