last change in ui gave error , attempting a fix

app.py

@@ -5,9 +5,10 @@ import faiss
 from sentence_transformers import SentenceTransformer
 from bs4 import BeautifulSoup
 import gradio as gr
+import os
 
 # Configure Gemini API key
-GOOGLE_API_KEY = 'AIzaSyA0yLvySmj8xjMd0sedSgklg1fj0wBDyyw'  # Replace with your API key
+GOOGLE_API_KEY = 'YOUR_API_KEY_HERE'  # Replace with your API key
 genai.configure(api_key=GOOGLE_API_KEY)
 
 # Fetch lecture notes and model architectures