When I first used WP Clone with moving a WordPress 3.5.1 to a new server as a test, it worked fine. But then I tried to repeat this process again, with the same host, and the same domain, and I keep getting this error "Error Message : MySQL server has gone away". I tried all kinds of combinations: full backup, just database, using wpdb -- all to no avail. What does this error mean? And why it worked the first time and now it's not working?