Update app.py

app.py

@@ -11,7 +11,7 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 # Modified to use OpenAI GPT-4 API for Q&A
 class BasicAgent:
     def __init__(self):
-        self.api_key = os.getenv("OPENAI_API_KEY")
+        self.api_key = os.getenv("OPEN_API_KEY")
         if not self.api_key:
             raise ValueError("OPENAI_API_KEY environment variable is not set!")
         openai.api_key = self.api_key