Update app.py

app.py

@@ -64,7 +64,7 @@ thumbnails = [get_thumbnail(image, 50) for image in choices]
 def get_slider_labels():
     labels = []
     for i in range(len(choices)):
-        label = f'<img src="data:image/png;base64,{gr.interface.util.to_base64_string(thumbnails[i])}" width="50" height="50">'
+        label = f'<img src="data:image/png;base64,{gr.interface.utils.to_base64_string(thumbnails[i])}" width="50" height="50">'
         labels.append(label)
     return labels