I had to set up my WordPress account all over again after my web server deleted my account. After many failed attempts I was able to install WP and create a new account. I'm able to access the dashboard and everything, but when I go to my URL the following message appears:
Fatal error: Call to undefined function body_class() in /home/a4734548/public_html/blog/wp-content/themes/twentyeleven/header.php on line 70
I need to fix this ASAP since my blog is part of a school project and I'm being graded on it.