Error on ThemeMagic

Getting this error under Theme Magic:

You have navigated to another page which using another template or your current preview page does not support LESS. ThemeMagic has been temporarily disabled.

I copied and renamed the T3b3 Blank and then after saving it went to ThemeMagic and got this error.

Something seems the matter with the templates? I have the latest versions of Joomla as well as the T3.

BitByte