ModuleNotFoundError: No module named 'gpt_index'

I run locally a pretty simple instance of text-davinci-003, using gpt_index
It works just fine
I wanted to have a permanent online url and created a space, uploaded my file(s) and it throws me the error as seen in title.

Clearly gpt_index is not available, but how could I make it available in the space?
This is the space if that is important: Toolset - a Hugging Face Space by TukuToi
I can also see others use it… app.py · rsunner/GPT-Index_simple_upload at main
So I guess it is something simple I miss?

Thanks!

Meh - rookie mistake

Added a requirements.txt with below content…

gpt-index
PyPDF2