Fatal error: Call to undefined function is_blog_installed() in /home/aath/public_html/wp-includes/load.php on line 429

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'wp_ob_end_flush_all' was given in /home/aath/public_html/wp-includes/plugin.php on line 405