Update app.py

detailed error message

app.py

@@ -210,7 +210,7 @@ if st.button('Submit'):
             csv = convert_df(pd.DataFrame(np.round(res, 4), columns=['output']))
             st.download_button(label="Download Predictions",data=csv,file_name='tcresm_predictions.csv', mime='text/csv')
     except:
-        st.error('Please ensure you have uploaded the files before pressing the Submit button', icon="🚨")
+        st.error('Please ensure you have uploaded the files and chosen the correct model before pressing the Submit button', icon="🚨")