Update app.py

app.py

@@ -27,8 +27,8 @@ GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
 class BasicAgent:
     def __init__(self):
         print("LangGraph ReAct Agent initialized.")
-        if not OPENAI_API_KEY:
-            raise ValueError("OPENAI_API_KEY environment variable not found.")
+        if not GOOGLE_API_KEY:
+            raise ValueError("GOOGLE_API_KEY environment variable not found.")
 
         self.llm = ChatGoogleGenerativeAI(model="gemini-2.0-flash")