Can not load main-rtl.css in new post page

[aminasoode]

After login in admin panel and go to new post page, a red box shows as "Failed to load content css: https://mydomain.com/wp-content/themes/MyBlog-master/assets/css/main-rtl.css" but there is no main-rtl.css in CSS folder.

[peymanslh]

This error doesn't break website work process, I'm fixing this error today.