function issue

I am trying to use a different theme selected from the options available on the admin page….I have downloaded them and i get the following error on all of them….I am not a php expert and possibly someone might tell me how this can be fixed> Thanks in advance.

Fatal error: Unknown function: language_attributes() in /home/www/wwc-cho/wordpress2/wp-content/themes/blue-fade/header.php on line 2