How to reslove this issue

Product Help
1

conda search nanoplot -c biconda
Loading channels: failed

UnavailableInvalidChannel: HTTP 404 NOT FOUND for channel biconda https://conda.anaconda.org/biconda

The channel is not accessible or is invalid.

You will need to adjust your conda configuration to proceed.
Use conda config --show channels to view your configuration’s current state,
and use conda config --show-sources to view config file locations.

2

I think you’ve got a typo in your channel name. That package is available on the bioconda channel - but the command you’ve typed is biconda.