CSS Error message

I keep getting the following error - how do I fix it?
Failed to load content css: https://housemovingsolutions.com/wp-includes/js/tinymce/skins/lightgray/content.min.css
Thanks

Hello there,

I hope you are doing well today.

When do you get that error?
Are you using any kind of plugin to minify CSS or Javascript?

Best Regards,
Support