Update app.py

app.py

@@ -500,7 +500,7 @@ If the answer is a comma-separated list, apply the above rules for each element
                 add_base_tools=True # Consider what this adds, ensure it doesn't duplicate.
             )
         except Exception as e:
-            raise RuntimeError(f"Error initializing web agent: {e}")
+            raise RuntimeError(f"Error initializing main agent: {e}")
 
         # Update system prompt
         # It's generally better to pass the system prompt directly if possible