Update app.py

app.py

@@ -777,6 +777,9 @@ class PlanningReflectionAgent:
         GROQ_API_KEY = os.getenv("GROQ_API_KEY")
         if not GROQ_API_KEY:
             raise ValueError("GROQ_API_KEY not set!")
+        HUGGINGFACEHUB_API_TOKEN = os.getenv("HUGGINGFACEHUB_API_TOKEN")
+        if not HUGGINGFACEHUB_API_TOKEN:
+            raise ValueError("HUGGINGFACEHUB_API_TOKEN secret is not set! Please add it to your Space secrets.")
 
         self.tools = defined_tools