Cannot log into GNOME after upgrading to GNOME3 in testing

[H Xu <xusubsc@gmail.com>]

Hello everyone,

After I have upgraded to GNOME3 in wheezy, I'm unable to login to GNOME. 
When login, the following message is displayed on my screen:

"""
Oh, no! Something has gone wrong.

A problem has occurred and the system can't recover.
Please log out and try again.
"""

If I choose the fallback session, only the desktop background is 
displayed. No panel, no desktop files.

Could anyone help me?

Thanks,
Hong