Update app.py

app.py

@@ -20,7 +20,7 @@ def generate(message, history,temperature=0.7,max_tokens=768):
 mychatbot = gr.Chatbot(
 avatar_images=["user.png", "bots.png"], bubble_full_width=False, show_label=False, show_copy_button=True, likeable=True,)
         
-iface = gr.ChatInterface(fn=generate, chatbot=mychatbot, retry_btn=None, undo_btn=None)
+iface = gr.ChatInterface(fn=generate, chatbot=mychatbot, retry_btn="Retry", undo_btn="Undo")
         
 with gr.Blocks() as demo:
     gr.HTML("<center><h1>Chat with Solar</h1></center>")