WARNING: Built wheel for jupyter-panel-proxy is invalid: Metadata 1.2 mandates PEP 440 version, but 'None' is not

I’m trying to add something to jupyter-panel-proxy, and install it using pip, and get above error.
Please help me.
Thank you in advance!

Try to downgrade setuptools to a lower version

I’ve found a solution.
Because jupyter-panel-proxy uses the param package’s version module, I looked at the source and found out that have to make an annotated tag which accords with PEP 440 to a commit. Then that commit can be installed with a valid version tab.

Thanks everybody!