Update app.py

app.py

@@ -115,9 +115,9 @@ def get_file_size(file):
 
 # Display conversation history using Streamlit messages
 def display_conversation(history):
-    for i in range(len(_history["generated"])):
-        st.message(_history["past"][i], is_user=True, key=str(i) + "_user")
-        st.message(_history["generated"][i], key=str(i))
+    for i in range(len(history["generated"])):
+        st.message(history["past"][i], is_user=True, key=str(i) + "_user")
+        st.message(history["generated"][i], key=str(i))
 
 def main():
     st.markdown("<h1 style='text-align: center; color: blue;'>Chat with your PDF 🦜📄 </h1>", unsafe_allow_html=True)