Update app.py

app.py

@@ -5,6 +5,9 @@ from groq import Groq
 # 從環境變量中獲取 API 金鑰
 api_key = os.getenv("groq_key")
 
+if api_key is None:
+    raise ValueError("API key is not set. Please set the 'groq_key' environment variable.")
+
 # 初始化 groq 客戶端
 client = Groq(api_key=api_key)