Can't access wordpress web site

I changed the theme to classifier and it changed ok. I then clicked on the previous theme to change it back and everything stopped.

Now if I try to access the dashboard or web site I get the following error

Fatal error: Cannot redeclare has_shortcode() (previously declared in /hermes/bosweb/web161/b1613/ipg.paulsun/spiritualfitnessguide/wp-includes/shortcodes.php:153) in /hermes/bosweb/web161/b1613/ipg.paulsun/spiritualfitnessguide/wp-content/themes/digon/framework/functions/framework-functions.php on line 77

Any ideas would be most welcome.
Thank you