fix line

app.py

@@ -4,7 +4,7 @@ import tempfile
 from langchain.document_loaders.csv_loader import CSVLoader
 from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.vectorstores import FAISS
-from langchian.llms import CTransformers
+from langchain.llms import CTransformers
 from langchain.chains import ConversationalRetrievalChain
 
 DB_FAISS_PATH ='vectorstore/db_faiss'