Missing import streamlit?

[F041]

import streamlit as st
otherwise

def main():
    st.set_page_config(page_title="AI research agent", page_icon=":bird:")

    st.header("AI research agent :bird:")
    query = st.text_input("Research goal")

    if query:
        st.write("Doing research for ", query)

        result = agent({"input": query})

        st.info(result['output'])

gives error