You have been suspended for inactivity. It is a requirement that you login to the x10hosting forums once every two weeks to keep your account active; posting is never required. This is an automatic suspension, you're able to unsuspend yourself immediately.
Since this is an automatic suspension, you can suspend yourself by logging into the account management panel (http://x10hosting.com/panel.php) and following the links from the panel.
Please note that if you do not unsuspend yourself within ten days of the suspension date, your account will be terminated. I highly encourage you to act quickly.