# Kernel starting, please wait

**URL:** <https://discourse.jupyter.org/t/kernel-starting-please-wait/8535>\
**Category:** discuss\
**Created:** [March 29, 2021, 1:51pm UTC](https://discourse.jupyter.org/t/kernel-starting-please-wait/8535 "2021-03-29T13:51:13Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![anguslou](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/anguslou/32/4050_2.png) [@anguslou](https://discourse.jupyter.org/u/anguslou)\
**Post date:** [March 29, 2021, 1:51pm UTC](https://discourse.jupyter.org/t/kernel-starting-please-wait/8535/1 "2021-03-29T13:51:13Z")

</div>

I have been uninstalling/ reinstalling for different versions of Jupyter Notebook many times, and also downgrade tornado and reinstall Python, etc. No luck…Anyone can help?

[I 21:39:19.392 NotebookApp] Serving notebooks from local directory: C:\Users\Angus  
[I 21:39:19.392 NotebookApp] Jupyter Notebook 6.3.0 is running at:  
[I 21:39:19.392 NotebookApp] [http://localhost:8888/](http://localhost:8888/)  
[I 21:39:19.392 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).  
[W 21:39:26.804 NotebookApp] 404 GET /nbextensions/widgets/notebook/js/extension.js?v=20210329213919 (::1) 9.970000ms referer=http://localhost:8888/notebooks/NB\_03\_Deep\_Learning.ipynb  
[I 21:39:28.053 NotebookApp] Kernel started: 715c10a4-cdc9-472a-963a-8aa12ee0a482, name: python3  
Traceback (most recent call last):  
File “C:\Users\Angus\anaconda3\envs\nn\lib\runpy.py”, line 194, in \_run\_module\_as\_main  
return \_run\_code(code, main\_globals, None,  
File “C:\Users\Angus\anaconda3\envs\nn\lib\runpy.py”, line 87, in _run\_code  
exec(code, run\_globals)  
File “C:\Users\Angus\anaconda3\envs\nn\lib\site-packages\ipykernel\_launcher.py”, line 15, in  
from ipykernel import kernelapp as app  
File "C:\Users\Angus\anaconda3\envs\nn\lib\site-packages\ipykernel\_init_.py", line 2, in  
from .connect import \*  
File “C:\Users\Angus\anaconda3\envs\nn\lib\site-packages\ipykernel\connect.py”, line 10, in  
from subprocess import Popen, PIPE  
File “C:\Users\Angus\anaconda3\envs\nn\lib\subprocess.py”, line 51, in  
import threading  
File “C:\Users\Angus\threading.py”, line 173, in  
class EvenNumbersThread(Thread):  
NameError: name ‘Thread’ is not defined  
[I 21:39:31.058 NotebookApp] KernelRestarter: restarting kernel (1/5), new random ports  
Traceback (most recent call last):  
File “C:\Users\Angus\anaconda3\envs\nn\lib\runpy.py”, line 194, in \_run\_module\_as\_main  
return \_run\_code(code, main\_globals, None,  
File “C:\Users\Angus\anaconda3\envs\nn\lib\runpy.py”, line 87, in _run\_code  
exec(code, run\_globals)  
File “C:\Users\Angus\anaconda3\envs\nn\lib\site-packages\ipykernel\_launcher.py”, line 15, in  
from ipykernel import kernelapp as app  
File "C:\Users\Angus\anaconda3\envs\nn\lib\site-packages\ipykernel\_init_.py", line 2, in  
from .connect import \*  
File “C:\Users\Angus\anaconda3\envs\nn\lib\site-packages\ipykernel\connect.py”, line 10, in  
from subprocess import Popen, PIPE  
File “C:\Users\Angus\anaconda3\envs\nn\lib\subprocess.py”, line 51, in  
import threading  
File “C:\Users\Angus\threading.py”, line 173, in  
class EvenNumbersThread(Thread):  
NameError: name ‘Thread’ is not defined