Update app.py

app.py

@@ -18,6 +18,8 @@ from langchain_community.embeddings import HuggingFaceInstructEmbeddings
 # from langchain.vectorstores import FAISS
 from langchain_community.vectorstores import FAISS
 
+from langchain.text_splitter import CharacterTextSplitter
+
 # from langchain.memory import ConversationBufferMemory
 # from langchain.chains import ConversationalRetrievalChain
 # from htmlTemplates import css, bot_template, user_template