Update app.py

app.py

@@ -23,7 +23,8 @@ from openai import OpenAI
 from langchain_community.embeddings import OpenAIEmbeddings
 from langchain_community.vectorstores import Chroma
 from langchain_community.chat_models import ChatOpenAI
-from langchain.chains import LLMChain
+from langchain_classic.chains import LLMChain
+
 from langchain.prompts import PromptTemplate
 
 # ─── SETTINGS ────────────────────────────────────────────────────────────────────