thanks for the prompt reply. I did check all of the upload file so many times and i'm sure that I uploaded to the correct destination. In the board3portal v1.0.2 folder, it has a folder called "xml" which contains a filed called "modx.prosilver.en" do I suppose to upload that file also cause it was ...

Your Portal Version: v1.0.2
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Basic Knowledge
Boardlink: http://www.vietmaiyeu.com

What have you done before the problem was there?
this is my first mod after installing a fresh phpbb3 board.

What have you already tryed ...