sudden php error - can't access site backend

I went to update my themes and plugins and all of a sudden got a php error...the final line of the error log says:

Class 'Upfront_ChildTheme' not found in /home/jonesbra/public_html/wp-content/themes/uf-panino/functions.php on line 8

I've changed nothing on the site

(btw - i tried to contact you via live chat but over and over our connection was lost)