Panel preview not working

AutFirst · February 23, 2023, 1:51pm

The preview tab is empty (even for the miminum-set example) as shown following:

Animation

$ jupyter --version
Selected Jupyter core packages...
IPython          : 7.31.1
ipykernel        : 6.15.2
ipywidgets       : 7.6.5
jupyter_client   : 7.3.4
jupyter_core     : 4.11.1
jupyter_server   : 1.18.1
jupyterlab       : 3.4.4
nbclient         : 0.5.13
nbconvert        : 6.4.4
nbformat         : 5.5.0
notebook         : 6.4.12
qtconsole        : 5.2.2
traitlets        : 5.1.1

$ jupyter serverextension list
    - Validating...
      panel.io.jupyter_server_extension  ok
    - Validating...
      jupyter_resource_usage 0.7.1 ok
    - Validating...
      jupyterlab 3.4.4 ok
    - Validating...
      panel.io.jupyter_server_extension  ok
config dir: <some_path>\.jupyter
    panel.io.jupyter_server_extension enabled
config dir: <some_other_path>\etc\jupyter
    jupyter_resource_usage enabled
    jupyterlab enabled
    panel.io.jupyter_server_extension enabled

$ conda list panel
# Name                    Version                   Build  Channel
panel                     0.14.3           py39haa95532_0

The kernel I chose for the jupyter-lab is the same virtual environment that I executed the above code.
The return of “conda list jupyter-panel-proxy” is empty for me though (no such package found and no such package can be installed )

At the same time, I do see alarming warning messages after I press F12 (of chrome):

consumes:40 Unsatisfied version 3.4.4 of shared singleton module @jupyterlab/notebook (required ^3.6.0-beta.0)
getSingletonVersion @ consumes:40
consumes:40 Unsatisfied version 3.4.4 of shared singleton module @jupyterlab/settingregistry (required ^3.6.0-beta.0)
getSingletonVersion @ consumes:40
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/statusbar (required ^3.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 6.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/services (required ^6.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 1.33.0 from @jupyterlab/application-top of shared singleton module @lumino/widgets (required ^1.37.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/translation (required ^3.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/apputils (required ^3.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/ui-components (required ^3.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/notebook (required ^3.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.152ba1289827b31fd2fb.js:1 Unsatisfied version 5.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/coreutils (required ^5.6.1)
s @ remoteEntry.152ba1289827b31fd2fb.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 5.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/coreutils (required ^5.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 No satisfying version (^3.4.5) of shared module @jupyterlab/docregistry found in shared scope default.
Available versions: 3.4.4 from @jupyterlab/application-top
c @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/mainmenu (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/docmanager (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/application (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/ui-components (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/settingregistry (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/notebook (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
remoteEntry.d748278d6fcf6c58bf94.js:1 Unsatisfied version 3.4.4 from @jupyterlab/application-top of shared singleton module @jupyterlab/apputils (required ^3.4.5)
f @ remoteEntry.d748278d6fcf6c58bf94.js:1
DevTools failed to load source map: Could not load content for chrome-extension://cfhdojbkjhnklbpkdaibdccddilifddb/browser-polyfill.js.map: System error: net::ERR_FILE_NOT_FOUND
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/main.c047a5cb14c1d595046d.js.map?v=c047a5cb14c1d595046d: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/9473.5a9c6a963b6aaa178bc3.js.map?v=5a9c6a963b6aaa178bc3: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/6700.7d1bee36bbdf64ab0bd4.js.map?v=7d1bee36bbdf64ab0bd4: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/2719.1001d896f21f09c3f99f.js.map?v=1001d896f21f09c3f99f: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1036.e3242066e92a791822b6.js.map?v=e3242066e92a791822b6: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1033.890eeae47460e241b1e9.js.map?v=890eeae47460e241b1e9: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/4155.784ca1752696680bf373.js.map?v=784ca1752696680bf373: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/4570.53adcb6f69939da383ff.js.map?v=53adcb6f69939da383ff: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/7294.f71c2889fedcd71bd1ee.js.map?v=f71c2889fedcd71bd1ee: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/3935.4159b022aa6d82e44127.js.map?v=4159b022aa6d82e44127: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/5096.96faf5ddac346a9ad9c3.js.map?v=96faf5ddac346a9ad9c3: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1142.074d125bb59f5a332666.js.map?v=074d125bb59f5a332666: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/3308.3a94151c0d57440646ab.js.map?v=3a94151c0d57440646ab: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/7755.d506a1d9dadf30b1e490.js.map?v=d506a1d9dadf30b1e490: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/807.96166378e2efe232d81e.js.map?v=96166378e2efe232d81e: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/4631.96a143e70f005fef7b59.js.map?v=96a143e70f005fef7b59: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/2040.6489997c35a5d7b0b100.js.map?v=6489997c35a5d7b0b100: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/3029.8636761a48c8422ce37f.js.map?v=8636761a48c8422ce37f: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1287.0e48071eeb17a3bea8e5.js.map?v=0e48071eeb17a3bea8e5: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1057.a0608544097dd22a589e.js.map?v=a0608544097dd22a589e: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/3502.c915d993b864739407e3.js.map?v=c915d993b864739407e3: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/6080.39703b8cc7bd284ce1bd.js.map?v=39703b8cc7bd284ce1bd: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/jlab_core.081dc2b13065c79d8463.js.map?v=081dc2b13065c79d8463: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/4151.fd7ca59b64f0adc97032.js.map?v=fd7ca59b64f0adc97032: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/3496.ecb0e7fcc54191234ae6.js.map?v=ecb0e7fcc54191234ae6: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/911.0c08f040896753efc653.js.map?v=0c08f040896753efc653: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/126.1e2fb998804b27c72a3e.js.map?v=1e2fb998804b27c72a3e: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1358.9ab4f57e8227ce75f427.js.map?v=9ab4f57e8227ce75f427: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/1249.047c76b5ea96a41605db.js.map?v=047c76b5ea96a41605db: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/4429.c4f083ef6b6e29345fd4.js.map?v=c4f083ef6b6e29345fd4: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/7796.a62f2ce2891c993a18e5.js.map?v=a62f2ce2891c993a18e5: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load source map: Could not load content for http://localhost:8889/static/lab/714.a8445b6bf08d4979bfe3.js.map?v=a8445b6bf08d4979bfe3: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

AutFirst · February 28, 2023, 1:18pm

Animation

Message in the terminal (Windows) that launched jupyterlab:

[W 2023-02-28 14:11:43.580 ServerApp] Got events for closed stream <zmq.eventloop.zmqstream.ZMQStream object at 0x0000019EE1005040>
[E 2023-02-28 14:11:54.522 ServerApp] Uncaught exception GET /panel/ (::1)
    HTTPServerRequest(protocol='http', host='localhost:8891', method='GET', uri='/panel/', version='HTTP/1.1', remote_ip='::1')
    Traceback (most recent call last):
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\tornado\web.py", line 1704, in _execute
        result = await result
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\jupyter_server_proxy\websocket.py", line 91, in get
        return await self.http_get(*args, **kwargs)
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\jupyter_server_proxy\handlers.py", line 683, in http_get
        return await ensure_async(self.proxy(self.port, path))
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\jupyter_server\utils.py", line 182, in ensure_async
        result = await obj
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\jupyter_server_proxy\handlers.py", line 677, in proxy
        await self.ensure_process()
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\jupyter_server_proxy\handlers.py", line 654, in ensure_process
        await proc.start()
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\site-packages\simpervisor\process.py", line 90, in start
        self.proc = await asyncio.create_subprocess_exec(
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\asyncio\subprocess.py", line 236, in create_subprocess_exec
        transport, protocol = await loop.subprocess_exec(
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\asyncio\base_events.py", line 1676, in subprocess_exec
        transport = await self._make_subprocess_transport(
      File "C:\ProgramData\Anaconda3\envs\env_panel\lib\asyncio\base_events.py", line 498, in _make_subprocess_transport
        raise NotImplementedError
    NotImplementedError
[E 2023-02-28 14:11:54.526 ServerApp] {
      "Host": "localhost:8891",
      "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
      "Referer": "http://localhost:8891/lab",
      "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36"
    }

Marc · March 4, 2023, 6:17pm

Hi @AutFirst

The root cause of your problem can be many, many things.

I would recommend trying to create a new minimal conda environment with panel and jupyterlab installed. Base the environment on a recent version of Python like 3.9 or 3.10.

Then start jupyter lab from the environment.

Then create a notebook with the two cells

import panel as pn
pn.extension()

pn.panel("hello").servable()

If that does not work, then report back.
If that works you can try additionally installing your packages and try running your full notebook. If the full notebook does not work, then try to remove cells until it works.