Update app.py

app.py

@@ -19,7 +19,7 @@ def main():
 
     # Initialize chat history in the first run
     if 'chat_history' not in st.session_state:
-        st.session_state['chat_history'] = []
+        st.session_state['chat_history'] = ''
     
     st.session_state['chat_history'] += "<div style='color: blue;'>You: </div>"
     st.markdown(st.session_state['chat_history'], unsafe_allow_html=True)