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Blank Dashboard in WordPress after moving website

After I restored and moved a website for a client the Dashboard section was completely empty. I couldn’t get to Posts, Media etc. I had to go to /wp-admin/includes/screen.php and on line 706 find the following PHP statement: <?php echo self::$this->_help_sidebar; ?>, then replace it with the statement: <?php echo $this->_help_sidebar; ?>.