Python Jupyter实验室不开放

我是初学者。请帮忙。当我传递jupyter lab命令时，会发生以下错误：-

请帮忙！！！我不能再使用Jupyter实验室了，这对我来说是个极大的问题

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谢谢。

从我的角度来看，重新安装Jupyter Lab可能会更快更容易，如果需要，可能会创建一个新的conda环境。 还有一件事，当一切顺利时，你可以考虑备份你的康达环境。

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非常感谢您！！！！

Traceback (most recent call last):
  File "c:\users\parijat basak\anaconda3\lib\site-packages\jupyterlab_server\server.py", line 20, in <module>
    from notebook.notebookapp import aliases, flags, NotebookApp as ServerApp
  File "c:\users\parijat basak\anaconda3\lib\site-packages\notebook\notebookapp.py", line 51, in <module>
    from zmq.eventloop import ioloop
  File "C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\__init__.py", line 50, in <module>
    from zmq import backend
  File "C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\backend\__init__.py", line 40, in <module>
    reraise(*exc_info)
  File "C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\utils\sixcerpt.py", line 34, in reraise
    raise value
  File "C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\backend\__init__.py", line 27, in <module>
    _ns = select_backend(first)
  File "C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\backend\select.py", line 28, in select_backend
    mod = __import__(name, fromlist=public_api)
  File "C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (constants, error, message, context,
ImportError: cannot import name 'constants' from partially initialized module 'zmq.backend.cython' (most likely due to a circular import) (C:\Users\Parijat Basak\AppData\Roaming\Python\Python38\site-packages\zmq\backend\cython\__init__.py)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\users\parijat basak\anaconda3\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\parijat basak\anaconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\Parijat Basak\anaconda3\Scripts\jupyter-lab.EXE\__main__.py", line 4, in <module>
  File "c:\users\parijat basak\anaconda3\lib\site-packages\jupyterlab\labapp.py", line 14, in <module>
    from jupyterlab_server import slugify, WORKSPACE_EXTENSION
  File "c:\users\parijat basak\anaconda3\lib\site-packages\jupyterlab_server\__init__.py", line 4, in <module>
    from .app import LabServerApp
  File "c:\users\parijat basak\anaconda3\lib\site-packages\jupyterlab_server\app.py", line 9, in <module>
    from .server import ServerApp
  File "c:\users\parijat basak\anaconda3\lib\site-packages\jupyterlab_server\server.py", line 26, in <module>
    from jupyter_server.base.handlers import (                          # noqa
ModuleNotFoundError: No module named 'jupyter_server'