update

app.py

@@ -77,7 +77,7 @@ with gr.Blocks() as demo:
 
     memory = ConversationBufferWindowMemory(k=10, memory_key="chat_history")
 
-    chatbot = gr.Chatbot([[None, None]], label='AI')
+    chatbot = gr.Chatbot([], label='AI')
     msg = gr.Textbox(value="", label='请输入：')
     with gr.Row():
         clear = gr.Button("清空对话", scale=2)
@@ -138,7 +138,7 @@ with gr.Blocks() as demo:
 
             print(history)
             messages = []         
-            for user_message, assistant_message in history[1:-1]:
+            for user_message, assistant_message in history[:-1]:
                 messages.append({"role": "user", "content": user_message})
                 messages.append({"role": "assistant", "content": assistant_message})
             messages.append({"role": "user", "content": history[-1][0]})