Remove "Add Widget" from Sidebar

Hi!

I recently created a new site using one of the Studio 2.1.5 theme, and seem to be having trouble removing the text on the right side of the body of the page that say, "Please log in and add widgets to this column. Add Widgets" You can see an example by going to http://cranbrookphotobooth.com/about-our-booths/

I don't currently have any sidebar widgets enabled / installed, and would really like to get rid of this information to make my site as professional as possible.

Any help would be much appreciated.