Fatal error: Call to undefined function block_list() in /home/xxx/public_html/drupal/includes/theme.inc on line 1580

請問~畫面進後台/user
會跳出這個訊息是什麼意思~??

Fatal error: Call to undefined function block_list() in /home/xxx/public_html/drupal/includes/theme.inc on line 1580