Update app.py

app.py

@@ -88,7 +88,11 @@ def upload_log_to_hf(local_path: Path, participant_id: str):
 # ---------------------------
 
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
-client = OpenAI()
+
+if not OPENAI_API_KEY:
+    raise ValueError("Missing OPENAI_API_KEY environment variable!")
+
+client = OpenAI(api_key=OPENAI_API_KEY)
 
 def call_llm_for_order(role: str, local_state: dict, info_sharing_visible: bool, demand_history: list, max_tokens=40, temperature=0.7):
     """