error messages for wrong inputs

app.py

@@ -34,10 +34,10 @@ def controller(article_id:str):
 
     # check whether article markdown can be displayed
     if output["db"] is None :
-        gr.Error(f"Wrong format for input id : {article_id}")
+        gr.Error(f"Wrong format for input id : {article_id}",duration=5, visible=True)
         return None, None, None, None
     elif output["article_sections"] is None or output["filtered_sections"] is None:
-        gr.Error(f"Could not retrieve text for id {article_id} (id not found in database or abstract/fulltext unavailable on PubMed/PMC)")
+        gr.Error(f"Could not retrieve text for id {article_id} (id not found in database or abstract/fulltext unavailable on PubMed/PMC)",duration=5, visible=True)
         return None, None, None, None
     else : 
         article_markdown = get_article_markdown(article_id, output["article_sections"], output["filtered_sections"])