Show blank page if using streamlit run main.py on macOS

Using Streamlit
1

Run Streamlit hello. It works but use streamlit run main.py. It does not work

Screen Shot 2025-06-15 at 12.12.57
Screen Shot 2025-06-15 at 12.12.571833×303 11.2 KB

2

Did you save the contents of main.py? Streamlit will not reflect the content of main.py until the content is saved.

3

main.py has been already saved before execute

4

Two months ago, it worked but now not work. It cannot support streamlit local server

5
  • Does streamlit hello work?
  • Does streamlit run work for any other file?
    1. Go to a clean directory.
    2. Create a simple app
      import streamlit as st
st.write("hello")
    3. Can you streamlit run the simple app?
6

Hi Debbie,

All work for me. Thank