Update app.py

app.py

@@ -21,6 +21,7 @@ from langchain_core.documents import Document
 from sklearn.feature_extraction.text import TfidfVectorizer
 from sklearn.metrics.pairwise import cosine_similarity
 from datetime import datetime
+from huggingface_hub.utils import HfHubHTTPError
 
 huggingface_token = os.environ.get("HUGGINGFACE_TOKEN")