# JupyterNotebook "stalling" on Macbook Air

**URL:** <https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453>\
**Category:** ipynb\
**Tags:** how-to, help-wanted, notebook\
**Created:** [July 18, 2023, 5:01am UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453 "2023-07-18T05:01:52Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Arslan\_Sdq](https://avatars.discourse-cdn.com/v4/letter/a/e19b73/32.png) [@Arslan\_Sdq](https://discourse.jupyter.org/u/Arslan_Sdq)\
**Post date:** [July 18, 2023, 5:01am UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/1 "2023-07-18T05:01:52Z")

</div>

Hi All,

I am using a Jupyter Notebook on Macbook Air, but constantly ruuning in to issues of notebook “stalling” after running a few cells. I am doing data analysis using Matplotlib, and it a simple code to plot the data. The same notebook (.ipynb) runs fine on the Windows but gets stuck when running on Macbook Air. Could you pleas ehelp me how to resolve this issue?

He is a list of errors I see in the Terminal.

“[E 14:30:55.952 NotebookApp] Uncaught exception in ZMQStream callback  
Traceback (most recent call last):  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 584, in \_run\_callback  
f = callback(\*args, \*\*kwargs)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 308, in stream\_callback  
return callback(self, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/services/kernels/handlers.py”, line 572, in \_on\_zmq\_reply  
super().\_on\_zmq\_reply(stream, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/base/zmqhandlers.py”, line 256, in \_on\_zmq\_reply  
self.write\_message(msg, binary=isinstance(msg, bytes))  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 334, in write\_message  
return self.ws\_connection.write\_message(message, binary=binary)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1081, in write\_message  
fut = self.\_write\_frame(True, opcode, message, flags=flags)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1056, in \_write\_frame  
return self.stream.write(frame)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 539, in write  
self.\_handle\_write()  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 965, in \_handle\_write  
self.\_write\_buffer.advance(num\_bytes)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 182, in advance  
assert 0 \< size \<= self.\_size  
AssertionError  
[E 14:30:55.952 NotebookApp] Uncaught exception in zmqstream callback  
Traceback (most recent call last):  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 634, in \_handle\_events  
self.\_handle\_recv()  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 663, in \_handle\_recv  
self.\_run\_callback(callback, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 584, in \_run\_callback  
f = callback(\*args, \*\*kwargs)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 308, in stream\_callback  
return callback(self, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/services/kernels/handlers.py”, line 572, in \_on\_zmq\_reply  
super().\_on\_zmq\_reply(stream, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/base/zmqhandlers.py”, line 256, in \_on\_zmq\_reply  
self.write\_message(msg, binary=isinstance(msg, bytes))  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 334, in write\_message  
return self.ws\_connection.write\_message(message, binary=binary)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1081, in write\_message  
fut = self.\_write\_frame(True, opcode, message, flags=flags)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1056, in \_write\_frame  
return self.stream.write(frame)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 539, in write  
self.\_handle\_write()  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 965, in \_handle\_write  
self.\_write\_buffer.advance(num\_bytes)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 182, in advance  
assert 0 \< size \<= self.\_size  
AssertionError  
[E 14:30:55.953 NotebookApp] Exception in callback functools.partial(\<function ZMQStream.\_update\_handler.. at 0x1047c9700\>)  
Traceback (most recent call last):  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/ioloop.py”, line 738, in \_run\_callback  
ret = callback()  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 718, in   
self.io\_loop.add\_callback(lambda: self.\_handle\_events(self.socket, 0))  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 634, in \_handle\_events  
self.\_handle\_recv()  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 663, in \_handle\_recv  
self.\_run\_callback(callback, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 584, in \_run\_callback  
f = callback(\*args, \*\*kwargs)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 308, in stream\_callback  
return callback(self, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/services/kernels/handlers.py”, line 572, in \_on\_zmq\_reply  
super().\_on\_zmq\_reply(stream, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/base/zmqhandlers.py”, line 256, in \_on\_zmq\_reply  
self.write\_message(msg, binary=isinstance(msg, bytes))  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 334, in write\_message  
return self.ws\_connection.write\_message(message, binary=binary)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1081, in write\_message  
fut = self.\_write\_frame(True, opcode, message, flags=flags)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1056, in \_write\_frame  
return self.stream.write(frame)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 539, in write  
self.\_handle\_write()  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 965, in \_handle\_write  
self.\_write\_buffer.advance(num\_bytes)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 182, in advance  
assert 0 \< size \<= self.\_size  
AssertionError”

I have tried updating/upgrading downgrading python/notebook and installed/reinstalled libraries etc., but none of that worked. Please let me know how can I get away with this?

Thanks,  
Arslan

---

<div class="post-metadata">

**Author:** ![fomightez](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/fomightez/32/495_2.png) [@fomightez](https://discourse.jupyter.org/u/fomightez)\
**Post date:** [July 18, 2023, 12:31pm UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/2 "2023-07-18T12:31:24Z")

</div>

> [@Arslan\_Sdq](#):
>
> The same notebook (.ipynb) runs fine on the Windows but gets stuck when running on Macbook Air.

This isn’t accurate from what you post under, “He[sic] is a list of errors I see in the Terminal.”. Your title also isn’t accurate given that. It’s not ‘stalling’ after running a few cells. It’s encountering errors when it encounters specific code and exiting running. I’m pretty sure if you add more cells that don’t happen to have that specific code, such as simple math calculations, they’d probably continue to run. And so it isn’t that in general your Macbook is running a few cells and then quitting.

Why does that matter…Having a clear assessment of what is happening is important when trying to tease out what is going on. This notebook would probably not run fine on a Windows machine that **had the same environment as your Macbook**. This though is hard to 100% say because you aren’t allowing a clear assessment because you only really share the ‘effect’. You aren’t sharing any code so the ‘cause’ can be better examined. Now that may not be necessary here, but in general, it is better way to post asking for help. Anyway, I would think if you had a much more similar environment on each machine, you’d probably get the same result that you see. It isn’t a Windows vs. Macbook issue. Your Macbook seems to not have all the consistent packages necessary to run Jupyter. I wonder if as [here](https://github.com/spyder-ide/spyder/issues/6783#issue-306179886) you downgrade tornado or upgrade it, or upgrade ipykernel, if it will fix it. You may find more ideas on this forum or Stackoverflow if you search the specific start errors or the final ones you see. However, it may be easier at this point to switch to installing [the Anaconda Distribution](https://docs.anaconda.com/free/anaconda/index.html) on your Macbook, and work in there and and see if it fixes things. If you do that, make sure you follow the ‘Getting Started’ Anaconda Distribution documentation exactly.

---

<div class="post-metadata">

**Author:** ![Arslan\_Sdq](https://avatars.discourse-cdn.com/v4/letter/a/e19b73/32.png) [@Arslan\_Sdq](https://discourse.jupyter.org/u/Arslan_Sdq)\
**Post date:** [July 19, 2023, 4:43am UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/3 "2023-07-19T04:43:30Z")

</div>

Hi,

Thanks for your quick reponse, and apologies for not being clear in the previous question. Jupyter Notebook runs the cells but when It comes to interacting plots, it stops workign and I see “buffering” sign in the Chrome tab, and nothing happens if i leave it like that until I restart the kernel/notebook, and it gets stuck there again. Please see the cause and erros below, and please let me know how can I resolve it?

-CAUSE-

#fig.subplots\_adjust(top=5.85)

colormap = plt.colormaps.get\_cmap(‘copper’)  
cmap = plt.colormaps.get\_cmap(‘viridis’)

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(10, 4))

ax1.plot (T3, F3\_3, label=‘3rd’, c=colormap(0.2))  
ax1.plot (T3, F3\_5, label=‘5th’, c=colormap(0.4))  
ax1.plot (T3, F3\_7, label=‘7th’, c=colormap(0.6))  
ax1.plot (T3, F3\_9, label=‘9th’, c=colormap(0.8))  
ax1.plot (T3, F3\_11, label=‘13th’, c=colormap(1.0))  
#ax1.set\_xlim (0, 32)  
#ax.set\_ylim (-8,0)

ax1twin = ax1.twinx()  
ax1twin.plot (T3, D3\_3, label=‘3rd D’, c=cmap(0.2))  
ax1twin.plot (T3, D3\_5, label=‘3rd D’, c=cmap(0.4))  
ax1twin.plot (T3, D3\_7, label=‘3rd D’, c=cmap(0.6))  
ax1twin.plot (T3, D3\_9, label=‘3rd D’, c=cmap(0.8))  
ax1twin.plot (T3, D3\_11, label=‘3rd D’, c=cmap(1.0))  
#ax1twin.set\_ylabel (‘Dissipation’, color = ‘r’)  
#ax2.set\_ylim (-0.2,2)

ax1.set\_xlabel (‘Relative Time, min’)  
ax1.set\_ylabel (‘Relative Frequency, Hz’)  
ax1twin.set\_ylabel (‘Dissipation (x$10^{-6}$)’)

plt.subplots\_adjust(wspace=0.5)

#ax1.legend ([‘3rd F’, ‘5th F’, ‘7th F’, ‘9th F’, ‘11th F’], frameon=False, loc=“center left”)  
#ax1twin.legend ([‘3rd D’, ‘5th D’, ‘7th D’, ‘9th D’, ‘11th D’], frameon=False, loc=“center right”)

#2nd Subplot

ax2.plot (T3, F3\_3, label=‘3rd’, c=colormap(0.2))  
ax2.plot (T3, F3\_5, label=‘5th’, c=colormap(0.4))  
ax2.plot (T3, F3\_7, label=‘7th’, c=colormap(0.6))  
ax2.plot (T3, F3\_9, label=‘9th’, c=colormap(0.8))  
ax2.plot (T3, F3\_11, label=‘13th’, c=colormap(1.0))  
ax2.set\_xlim (30, 55)  
ax2.set\_ylim (-100,0)

ax2twin = ax2.twinx()  
ax2twin.plot (T3, D3\_3, label=‘3rd D’, c=cmap(0.2))  
ax2twin.plot (T3, D3\_5, label=‘3rd D’, c=cmap(0.4))  
ax2twin.plot (T3, D3\_7, label=‘3rd D’, c=cmap(0.6))  
ax2twin.plot (T3, D3\_9, label=‘3rd D’, c=cmap(0.8))  
ax2twin.plot (T3, D3\_11, label=‘3rd D’, c=cmap(1.0))  
#ax2twin.set\_ylabel (‘Dissipation’, color = ‘r’)  
ax2twin.set\_ylim (0,20)  
#ax2twin.set\_ylim (-6, 60)

ax2.set\_xlabel (‘Relative Time, min’)  
ax2.set\_ylabel (‘Relative Frequency, Hz’)  
ax2twin.set\_ylabel (‘Dissipation (x$10^{-6}$)’)

#Adjusting the colors of the y-ticks  
#ax1.tick\_params(axis=‘y’, colors=‘b’)  
#ax2.tick\_params(axis=‘y’, colors=‘b’)  
#ax1twin.tick\_params(axis=‘y’, colors=‘r’)  
#ax2twin.tick\_params(axis=‘y’, colors=‘r’)

#Adjusting the space between subplots  
plt.subplots\_adjust(wspace=0.5)

ax1.legend ([‘3rd F’, ‘5th F’, ‘7th F’, ‘9th F’, ‘11th F’], frameon=True, loc=“upper center”,  
bbox\_to\_anchor=(0.5, 1.15), ncol=3, fontsize=‘small’)  
ax2twin.legend ([‘3rd D’, ‘5th D’, ‘7th D’, ‘9th D’, ‘11th D’], frameon=True, loc=“upper center”,  
bbox\_to\_anchor=(0.5, 1.15), ncol=3, fontsize=‘small’)  
#fig.tight\_layout(rect=[0, 0, 1, 0.9])

-ERRORS-

[E 14:37:21.161 NotebookApp] Uncaught exception in ZMQStream callback  
Traceback (most recent call last):  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 584, in \_run\_callback  
f = callback(\*args, \*\*kwargs)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 308, in stream\_callback  
return callback(self, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/services/kernels/handlers.py”, line 572, in \_on\_zmq\_reply  
super().\_on\_zmq\_reply(stream, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/base/zmqhandlers.py”, line 256, in \_on\_zmq\_reply  
self.write\_message(msg, binary=isinstance(msg, bytes))  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 334, in write\_message  
return self.ws\_connection.write\_message(message, binary=binary)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1081, in write\_message  
fut = self.\_write\_frame(True, opcode, message, flags=flags)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1056, in \_write\_frame  
return self.stream.write(frame)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 539, in write  
self.\_handle\_write()  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 965, in \_handle\_write  
self.\_write\_buffer.advance(num\_bytes)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 182, in advance  
assert 0 \< size \<= self.\_size  
AssertionError  
[E 14:37:21.163 NotebookApp] Uncaught exception in zmqstream callback  
Traceback (most recent call last):  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 634, in \_handle\_events  
self.\_handle\_recv()  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 663, in \_handle\_recv  
self.\_run\_callback(callback, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 584, in \_run\_callback  
f = callback(\*args, \*\*kwargs)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 308, in stream\_callback  
return callback(self, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/services/kernels/handlers.py”, line 572, in \_on\_zmq\_reply  
super().\_on\_zmq\_reply(stream, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/base/zmqhandlers.py”, line 256, in \_on\_zmq\_reply  
self.write\_message(msg, binary=isinstance(msg, bytes))  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 334, in write\_message  
return self.ws\_connection.write\_message(message, binary=binary)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1081, in write\_message  
fut = self.\_write\_frame(True, opcode, message, flags=flags)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1056, in \_write\_frame  
return self.stream.write(frame)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 539, in write  
self.\_handle\_write()  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 965, in \_handle\_write  
self.\_write\_buffer.advance(num\_bytes)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 182, in advance  
assert 0 \< size \<= self.\_size  
AssertionError  
[E 14:37:21.166 NotebookApp] Exception in callback functools.partial(\<function ZMQStream.\_update\_handler.. at 0x106d1b550\>)  
Traceback (most recent call last):  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/ioloop.py”, line 738, in \_run\_callback  
ret = callback()  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 718, in   
self.io\_loop.add\_callback(lambda: self.\_handle\_events(self.socket, 0))  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 634, in \_handle\_events  
self.\_handle\_recv()  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 663, in \_handle\_recv  
self.\_run\_callback(callback, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 584, in \_run\_callback  
f = callback(\*args, \*\*kwargs)  
File “/opt/homebrew/lib/python3.9/site-packages/zmq/eventloop/zmqstream.py”, line 308, in stream\_callback  
return callback(self, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/services/kernels/handlers.py”, line 572, in \_on\_zmq\_reply  
super().\_on\_zmq\_reply(stream, msg)  
File “/opt/homebrew/lib/python3.9/site-packages/notebook/base/zmqhandlers.py”, line 256, in \_on\_zmq\_reply  
self.write\_message(msg, binary=isinstance(msg, bytes))  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 334, in write\_message  
return self.ws\_connection.write\_message(message, binary=binary)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1081, in write\_message  
fut = self.\_write\_frame(True, opcode, message, flags=flags)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/websocket.py”, line 1056, in \_write\_frame  
return self.stream.write(frame)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 539, in write  
self.\_handle\_write()  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 965, in \_handle\_write  
self.\_write\_buffer.advance(num\_bytes)  
File “/opt/homebrew/lib/python3.9/site-packages/tornado/iostream.py”, line 182, in advance  
assert 0 \< size \<= self.\_size  
AssertionError

Please let me know what’s the issue, and how can I reoslve it?

Thanks,  
Arslan

---

<div class="post-metadata">

**Author:** ![fomightez](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/fomightez/32/495_2.png) [@fomightez](https://discourse.jupyter.org/u/fomightez)\
**Post date:** [July 19, 2023, 12:20pm UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/4 "2023-07-19T12:20:03Z")

</div>

Did you try anything else from my last post other than running the same notebook again? It seems you have inconsistent/outdated versions as discussed in that link I referenced. A number of approaches to finding a solution were discussed there.

---

<div class="post-metadata">

**Author:** ![mikecro](https://avatars.discourse-cdn.com/v4/letter/m/74df32/32.png) [@mikecro](https://discourse.jupyter.org/u/mikecro)\
**Post date:** [July 20, 2023, 8:47am UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/5 "2023-07-20T08:47:19Z")

</div>

I have a similar but not identical situation on Windows 10. See [Jupyter Notebook "stalling" on Windows 10](https://discourse.jupyter.org/t/jupyter-notebook-stalling-on-windows-10/20483)

What version of tornado do you advise rolling back to?

---

<div class="post-metadata">

**Author:** ![mikecro](https://avatars.discourse-cdn.com/v4/letter/m/74df32/32.png) [@mikecro](https://discourse.jupyter.org/u/mikecro)\
**Post date:** [July 26, 2023, 8:36am UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/6 "2023-07-26T08:36:52Z")

</div>

There seems to be a longstanding issue [Jupyter Notebook ‘zmq message arrived on closed channel’ Error · Issue #6721 · jupyter/notebook · GitHub](https://github.com/jupyter/notebook/issues/6721) & [https://github.com/microsoft/vscode-jupyter/issues/12775](https://github.com/microsoft/vscode-jupyter/issues/12775)

A common thread seems to downgrade jupyter\_client to before 8.0.0  
One suggests `pip3.10 install IPython==8.4.0 ipykernel==6.15.2 ipywidgets==7.7.2 \ jupyter==1.0.0 jupyter_client==7.3.5 jupyter_core==4.12.0 jupyter-console==6.5.1 jupyter_server==1.21.0 \ nbclient==0.6.7 nbformat==5.4.0 notebook==6.4.12 traitlets==5.4.0 qtconsole==5.3.1`

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<div class="post-metadata">

**Author:** ![mikecro](https://avatars.discourse-cdn.com/v4/letter/m/74df32/32.png) [@mikecro](https://discourse.jupyter.org/u/mikecro)\
**Post date:** [August 2, 2023, 9:08am UTC](https://discourse.jupyter.org/t/jupyternotebook-stalling-on-macbook-air/20453/7 "2023-08-02T09:08:12Z")

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The errors reported are in the console output - not the code.  
There is a longstanding issue [Jupyter Notebook ‘zmq message arrived on closed channel’ Error · Issue #6721 · jupyter/notebook · GitHub](https://github.com/jupyter/notebook/issues/6721) & [https://github.com/microsoft/vscode-jupyter/issues/12775](https://github.com/microsoft/vscode-jupyter/issues/12775)

This is the first Jupyter bug I have encountered. What happens to get it fixed?  
I have downgraded jupyter\_client - but since the error is intermittent, I can’t promise that is a viable workaround.