Update app.py

app.py

@@ -1613,7 +1613,7 @@ def langgraph_tab6_main(query: str, file=None):
         if "summary" in result:
             return result["summary"]
         return "No answer."
-     except Exception as e:
+    except Exception as e:
         logger.error(f"Error in main function: {e}")
         return f"[Tab6 Error] {str(e)}"