Update app.py

app.py

@@ -120,7 +120,7 @@ with gr.Blocks() as demo:
 
     def respond(message, chat_history):
         chat_history.append((message, md))
-        bot_message = gen(chat_history)
+        bot_message = gen(str(chat_history))
         time.sleep(1)
         return "", chat_history