Development mode/ skin selector not working

I have searched throught the forums and can’t seem to find the right answer. I am trying to install a new template and when I go to Skin Selector it says “Cart is in development mode now and skin selector is unavailable”. I have cleared the cache, I have deleted the files in the var/cache folder and I have done this in combination with clicking “Live Mode” and “Development Mode”. I’m not sure what else to do. One post I read mentioned looking in the config.local.php file and I noticed at the bottome it says define(‘DEVELOPMENT’,true). Tried changing that to false but it change anything. Help! :)