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With the latest update of the Google Chrome,  a new issue arose with menu display. 
In order to resolve it, check this article https://select.ticksy.com/article/11738


Missing style sheet error when installing the theme?

This is the common issue when installing a theme, this error message does not mean that the theme is broken. 

It means that the files are not uploaded correctly, and there is an easy fix for it described in this article.