Assets file not delete

As shown in the image, only this file is not deleted. How should I do it?

Probably it’s because of your slow internet connection…
Better follow error message
Try again later

For the moment I feel that the server has issues and as mentioned

The other thing you can do is to export your project.aia, open it with winrar or 7zip, go to assets and delete it and lastly import again to Kodular