Update app.py

app.py

@@ -55,7 +55,7 @@ with gr.Blocks(css=custom_css) as demo:
         [],
         elem_id="chatbot",
         bubble_full_width=False,
-        avatar_link = os.getenv('avatar_link')
+        avatar_link = os.getenv('avatar_link'),
         avatar_images=(None, avatar_link)
     )
     msg = gr.Textbox(