While I am trying very hard to backup some other stuffs from my ftp to my localdisk before the move to another host, i tried to upgrade my wordpress blog to 3.0 and I gotten this error…

Call to a member function add_rewrite_tag() on a non-object in…

Did a quick research and they ask me to deactivate my plugin which i did. ( Link here ) and here we go, it works… now I have to figure out, which plugin causes the problem before I continue.