Hi Xiao,
In order to verify the ownership of your domain you would need to follow the steps in this
article which include adding a property in the
Webmaster central [2] and then adding a special string to your DNS records.
Also as your issue seems to be a specific technical issue you would have better assistance from the community by posting in StackOverflow as Google Groups is intended for general discussion. You should post to StackOverflow with the extra log information to have the developer community assist you.