correction bug

app.py

@@ -285,7 +285,10 @@ def main():
     st.sidebar.text("6. You can now see the annotation \n   and the BPMN XML result")
     st.sidebar.text("7. You can modify and download \n   the result in right format")
 
-    st.sidebar.text("If there is an error, try to:\n change the score threshold \n recrop the image.")
+    st.sidebar.subheader("If there is an error, try to:")
+    st.sidebar.text("1. Change the score threshold")
+    st.sidebar.text("2. Re-crop the image by placing\n   the BPMN diagram in the center\n   of the image")
+    st.sidebar.text("3. Re-Launch the prediction")
 
     st.sidebar.subheader("You can close this sidebar")
 
@@ -341,6 +344,10 @@ def main():
                     perform_inference(model_object, model_arrow, st.session_state.crop_image, score_threshold)
                     st.session_state.prediction = modif_box_pos(st.session_state.prediction, object_dict)                    
                     st.balloons()
+    else:
+        #delete the prediction 
+        if 'prediction' in st.session_state:
+            del st.session_state['prediction']
 
 
     # If the prediction has been made and the user has uploaded an image, display the options for the user to annotate the image