fix error

app.py

@@ -61,12 +61,12 @@ def load_db(file, k):
 def chat(input_text, pdf_file):
     qa = load_db(pdf_file, 3)
     
-    if not memory.memory:
+    if not memory.memory_buffer:
         # If no previous conversation, start with a greeting
         response = qa.invoke({"question": "Hi, how can I help you today?", "chat_history": []})
         memory.update(response["chat_history"])
 
-    response = qa.invoke({"question": input_text, "chat_history": memory.memory})
+    response = qa.invoke({"question": input_text, "chat_history": memory.memory_buffer})
     
     # Extracting the helpful answer from the response
     match = re.search(r'Helpful Answer:(.*)', response['answer'])
@@ -78,14 +78,7 @@ def chat(input_text, pdf_file):
     # Update the chat history
     memory.update([(input_text, helpful_answer)])
 
-    # Combine relevant information into a single string for output
-    output_text = f"Question: {input_text}\nAnswer: {helpful_answer}\nGenerated Question: {response['generated_question']}\nSource Documents: {response['source_documents']}"
-
-    return output_text
-
-
+    return helpful_answer
 
 iface = gr.Interface(fn=chat, inputs=["text", "file"], outputs="text")
 iface.launch(share=True)
-
-