Update app.py

app.py

@@ -99,7 +99,6 @@ class Retriever:
 
     return retrieved_texts
 
-
 class RAG:
     def __init__(self,
                  file_path,
@@ -164,7 +163,7 @@ st.title("RAG Model Query Interface Chatbot")
 
 # Initialize session state to keep track of the list of answers and questions
 if 'history' not in st.session_state:
-    st.session_state.history = []
+    st.session_state['history'] = []
 
 question = st.text_input("Enter your question:")