Update app.py

app.py

@@ -246,7 +246,7 @@ if 'st.session_state.historical_data' not in st.session_state:
     st.session_state.historical_data = None
 
 if st.session_state.historical_data is None:
-    st.session_state.historical_data = generate_mock_historical_data(st.session_state.schedule_df)
+    st.session_state.historical_data = generate_mock_historical_data(schedule_df)
     st.session_state.historical_data['Date'] = pd.to_datetime(st.session_state.historical_data['Date'])
 
 if st.button("Generate Mock Historical Data"):