Update app.py

app.py

@@ -44,7 +44,7 @@ def initialize_agent(endpoint_uri: str):
 def main():
     uri = resolve_endpoint()
     if not uri:
-        print("❌ Endpoint not ready: no URI configured.")
+        print("❌ Endpoint not ready: no URI configured. Ensure that the HF_ENDPOINT_URI secret has been defined in the current Space.")
         sys.exit(1)   # exit with non-zero status for clarity
     ok, msg = is_endpoint_healthy(uri)
     if not ok: