[Python] Streamlit cant pickle load my custom object

## Packages
import pickle
from pathlib import Path
import streamlit as st

## Pathing
main_path = Path(__file__).parent.parent
file_path = main_path / 'out' / 'data.pickle'

## Load portfolio
with open(file_path, 'rb') as file:
pf = pickle.load(file)
st.title("Hello")


I have this simple script that pickle loads an object that I created using a custom_library. I can run this file with Python. However, when I try to run it with streamlit, I get an error:

ModuleNotFoundError: No module named 'custom_library'

Why are they behaving differently and how can I fix this?

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