Maybe an environment conflict, conda tab issue

[LilianYou]

Dear expert,

Basic info: I remotely run jupyter notebook on anaconda-navigator in a server. The server is using Ubuntu system and my local computer is on Mac Catalina. I run the notebook on chrome browser, so I don't think my local computer system matters.

Issue: I ran a notebook successfully and then made a copy of the original notebook. When I tried to run the copy, one package module couldn't be found, but the original notebook doesn't have any running issue. I searched and found that it could be an environment issue, so I added a condo tab in my Jupiter notebook. However, the conda tab shows error. Here is a screenshot of the first error ("An error occurred while retrieving package information."):

After I clicked 'OK', there is a second error ("An error occurred while listing Conda environments.
"):

When I click 'OK' again, it's just a tab with no content:

When I come back to the tab, the same above error just appear again.

I know there are people asking similar questions before, but I've solutions provided in those repositories and none of them work. Here are attempts that I've made:

First attempt:

jupyter serverextension disable nb_conda
jupyter serverextension enable nb_conda

Second attempt:

conda install -c conda-forge nb_conda_kernels
Third attempt:

conda update conda
conda update nb_conda

None of the above 'solutions' solve the issue.

Could anyone please point me in the right direction?

Very appreciated,
Lily