Thanks for your quick reply. Yes, I opened an issue in Github.
I used "jupyter labextension install jupyterlab_apod-2.0" to install this 
extension.
Then, Jupyterlab gives many errors in the backend terminal: 

      File 
"/Users/mariolzx/opt/anaconda3/envs/jupyterlab-ext/lib/python3.8/site-packages/jupyterlab/commands.py",
 
line 541, in get_latest_compatible_package_versions
        return handler.latest_compatible_package_versions(names)
      File 
"/Users/mariolzx/opt/anaconda3/envs/jupyterlab-ext/lib/python3.8/site-packages/jupyterlab/commands.py",
 
line 1659, in latest_compatible_package_versions
        for version, data in sorted(versions.items(),
    AttributeError: 'list' object has no attribute 'items'
[W 00:34:01.164 LabApp] Unhandled error
[E 00:34:01.164 LabApp] {
      "Host": "localhost:8889",
      "Connection": "keep-alive",
      "Authorization": "token 
9036729e7e9169af148077e9013f87175c6a321bfdd7c2ed",
      "Sec-Fetch-Dest": "empty",
      "X-Xsrftoken": 
"2|c7bf5288|ad42adaaeaf06d907f6001d1362da6c1|1584587174",
      "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) 
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36",
      "Dnt": "1",
      "Content-Type": "application/json",
      "Accept": "*/*",
      "Sec-Fetch-Site": "same-origin",
      "Sec-Fetch-Mode": "cors",
      "Referer": "http://localhost:8889/lab/workspaces/auto-E";,
      "Accept-Encoding": "gzip, deflate, br",
      "Accept-Language": "en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7",
      "Cookie": 
"_xsrf=2|c7bf5288|ad42adaaeaf06d907f6001d1362da6c1|1584587174; 
username-localhost-8888=\"2|1:0|10:1584670862|23:username-localhost-8888|44:YzM2M2YwMWEzNDIzNGExOGJkNmYzNDc4N2FlNjQxMWE=|94b8e91ab6b726d54eebae3e8a07699302286bec38506357e26c5c7268e29894\";
 
username-localhost-8889=\"2|1:0|10:1584851640|23:username-localhost-8889|44:N2RiMzgxODc3NDRkNGQ5NzliN2ZjOTg0NWVkOWQ5MGY=|ce448ab07f719f6df24d3924e946a8d6116c84f18ab5f79139e5c3af97613cd8\""
    }
[E 00:34:01.164 LabApp] 500 GET /lab/api/extensions?1584851641130 (::1) 
27.97ms referer=http://localhost:8889/lab/wor


In chrome, when I click extension manager, it prompts "Error communicating 
with server extension. Consult the documentation for how to ensure that it 
is enabled. 
Reason given: Error: 500 (Internal Server Error)"

Do you know why? Thanks a lot!


On Sunday, March 22, 2020 at 12:57:46 AM UTC-4, Jason Grout wrote:
>
> It should work in JupyterLab 2.0. Can you walk us through exactly what you 
> are doing and where you are seeing an error, and what that error is?
>
> Someone just opened an issue asking it was compatible: 
> https://github.com/jupyterlab/jupyterlab_apod/issues/4. Was that you? If 
> so, can we continue the conversation on the issue (or even better, an issue 
> in the jupyterlab repo) so it is easier to find for others?
>
> Thanks,
>
> Jason
>
>
> On Sat, Mar 21, 2020 at 9:12 PM Tom Lou <[email protected] <javascript:>> 
> wrote:
>
>> I mean how do I change the code to make it compatible with Jupyter Lab 
>> 2.0? Thanks
>>
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