If you have installed Kiweecommerce, you’ll notic that the new document you created after the Kiwee installation, the ID started from "402x"
According to Kiweecommerce’s forum, there is a fix
http://www.kiweecommerce.org/forum/viewtopic.php?t=26
I did that yesterday, and today I found some of my pages went wrong. For example, the text in the Chinsee page all messed up, and the form in the leave comment, where two inout fileds (name and email) were missing. Lukily I have a backup for my files.