Hi Jim,
I have deleted the bax.php and it error now gone. But it seems like the vendor shipping doesn't work. I tested it out. Make a one vendor, and use it on one product. When I added the product in the cart, the shipping that I chose for that vendor didn't show up. For example, I install free shipping but it didn't show up. Matter of fact, it didnt' even show shipping option up (i'm using one page check out).
I have searched for a solution til now I cannot find out an answer.
Do you have anything on this one, Jim? Thank you for your helps. I am really appreciate this.