please work

app.py

@@ -3,7 +3,7 @@ import random
 from huggingface_hub import InferenceClient
 from gradio.themes.utils import colors
 
-gr.themes.builder(
+theme = gr.themes.builder(
     primary_hue = colors.indigo,
     secondary_hue = colors.rose,
     neutral_hue = colors.gray
@@ -37,6 +37,6 @@ def random_message(message, history):
     random_choices = random.choice(choices)
     return random_choices
 
-chatbot = gr.ChatInterface(respond, type = "messages")
+chatbot = gr.ChatInterface(respond, type = "messages", theme=theme)
 
 chatbot.launch(debug=True)