In MW 1.33, I installed the extension:HierarchyBuilder by the manual.
In developer console, error message was shown.
"Refused to apply style from '......../index.php/Themes/apple/style.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled."
Is there a something big problem? or Do I have to just ignore the message?
By the way, hierarchy was shown normally.