Fatal error: Uncaught Error: Call to undefined function wp_body_open() in /var/www/wordpress/themes/twentyten.3.0/header.php:64 Stack trace: #0 /usr/share/wordpress/wp-includes/template.php(688): require_once() #1 /usr/share/wordpress/wp-includes/template.php(647): load_template('/var/lib/wordpr...', true) #2 /usr/share/wordpress/wp-includes/general-template.php(41): locate_template(Array, true) #3 /var/www/wordpress/themes/twentyten.2.4/single.php(10): get_header() #4 /usr/share/wordpress/wp-includes/template-loader.php(74): include('/var/www/wordpr...') #5 /usr/share/wordpress/wp-blog-header.php(19): require_once('/usr/share/word...') #6 /usr/share/wordpress/index.php(17): require('/usr/share/word...') #7 {main} thrown in /var/www/wordpress/themes/twentyten.3.0/header.php on line 64