Update app.py

app.py

@@ -76,7 +76,7 @@ if "vector" not in st.session_state:
 
     # JB:
     # https://python.langchain.com/docs/modules/data_connection/document_loaders/pdf#pypdf-directory
-    st.session_state.docs = loader.load()
+    st.session_state.docs = st.session_state.loader.load()
 
     st.session_state.text_splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=200)
     st.session_state.documents = st.session_state.text_splitter.split_documents(st.session_state.docs)