Minor fix

app.py

@@ -55,5 +55,5 @@ examples=[{'text':"I am planning to buy a dog and a cat. Suggest some breeds tha
 
 gr.ChatInterface(infer, chatbot=gr.Chatbot(height=600),
                 textbox=gr.Textbox(placeholder="How can I help you today", container=False,
-                                     scale=7), theme="soft", examples=examples, undo_btn=None,
+                                     scale=7), theme="soft", examples=examples,
                 title="Phi-3 Multimodel Assistant", multimodal=True).launch()