Apparently the mcrypt extension is no longer supported in the newer editions of the software used by x10 hosting and according to the guy in charge as shown on the announcement thread, x10 has no intention of updating the software used by the free users. You can find a fix for the error by looking up the mcrypt extension and going to the official page. It isnt an easy fix but if you want to stay with x10 hosting, its the only way to go. I personally left and am now with infinity free which provides the support for all accounts free or paid.