Copied ui-front->general files to native theme and nada thing!?

As it says in the title.. I did what I had read in one of the template page file itself.. where it says:

"You can override this file in your active theme."

I copied the files from the ui-front/general/ to my native theme and am now given this fatal error:

Fatal error: Using $this when not in object context in /wp-content/my_theme/page-my-classifieds.php on line 18

Line 18:
$options_general = $this->get_options( 'general' );

I don't fully comprehend what is going on as I was doing initially what was commented at the top of this page to do..

I'd really like to edit these ui-front files within my own theme so that future updates won't destroy custom code to the plugin itself.