Update app.py

app.py

@@ -24,6 +24,7 @@ from langchain_community.vectorstores.utils import filter_complex_metadata
 from langchain.schema import Document
 from langgraph.graph import START, END, StateGraph
 from langchain_community.document_loaders.directory import DirectoryLoader
+from langchain.document_loaders import TextLoader
 from functions import *