Update app.py

app.py

@@ -12,7 +12,7 @@ HF_TOKEN = os.getenv("HF_TOKEN")
 
 icons = {"assistant": "robot.png", "user": "man-kddi.png", "system": "man-kddi.png"}
 
-if API_KEY is None:
+if HF_TOKEN is None:
     st.error("API key not found. Please set the HF_TOKEN secret in your Hugging Face Space.")
     st.stop()