Could not import extension my-sphinx-theme(exception: No module named 'my-sphinx-theme')

[fish-train]

Hello, Pradyun!

1. I cloned furo-theme.
2. Replased 'furo' to 'my-sphinx-theme' in all files.
3. Ran succesful pip install -e ..
4. In conf.py, i specified 'html_theme = "my-sphinx-theme"'.
5. Ran stb serve docs/ and got mistake:

Extension error:                                                                                                        
Could not import extension my-sphinx-theme(exception: No module named 'my-sphinx-theme') 

Could you help me how to fix it?