JUPYTER NOTEBOOK IS NOT LAUNCHING

[ultradluffy8]

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First Anaconda Navigator was not launching, then I tried it via Anaconda Powershell Prompt, it worked but now Jupyter Notebook is not launching it shows this message in a pop up window-

**Traceback (most recent call last): File "C:\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in from notebook.notebookapp import main File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\notebook\notebookapp.py", line 47, in from zmq.eventloop import ioloop File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq_init_.py", line 47, in

from zmq import backend File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq\backend_init_.py", line 40, in reraise(exc_info) File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq\utils\sixcerpt.py", line 34, in reraise raise value File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq\backend_init_.py", line 27, in ns = select_backend(first) File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq\backend\select.py", line 28, in select_backend mod = import(name, fromlist=public_api) File "C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq\backend\cython_init.py", line 6, in from . import (constants, error, message, context, ImportError: cannot import name 'constants' from 'zmq.backend.cython' (C:\Users\Harshit\AppData\Roaming\Python\Python37\site-packages\zmq\backend\cython_init_.py)*

I also have reinstalled it 2 time but this dosn't work. I don't know what to do. Please help me.