Update app.py

app.py

@@ -17,6 +17,7 @@ from langgraph.graph import StateGraph, END
 import uuid
 import shutil, time, functools
 from langchain_experimental.open_clip.open_clip import OpenCLIPEmbeddings
+from langchain_core.utils.utils import secret_from_env
 # from matplotlib.offsetbox import OffsetImage, AnnotationBbox
 from io import BytesIO
 from pathlib import Path