[AUCTeX] forward/backward search not working

[Shiyuan]

Hi,
    I've just install AUCTeX but the forward/backward search is not working. The TeX-source-correlated-mode is turned on and the mode line is LaTeX/S.
My TeX-output-view-style value is
(("^dvi$"
  ("^landscape$" "^pstricks$\\|^pst-\\|^psfrag$")
  "%(o?)dvips -t landscape %d -o && gv %f")
 ("^dvi$" "^pstricks$\\|^pst-\\|^psfrag$" "%(o?)dvips %d -o && gv %f")
 ("^dvi$"
  ("^\\(?:a4\\(?:dutch\\|paper\\|wide\\)\\|sem-a4\\)$" "^landscape$")
  "%(o?)xdvi %dS -paper a4r -s 0 %d")
 ("^dvi$" "^\\(?:a4\\(?:dutch\\|paper\\|wide\\)\\|sem-a4\\)$" "%(o?)xdvi %dS -paper a4 %d")
 ("^dvi$"
  ("^\\(?:a5\\(?:comb\\|paper\\)\\)$" "^landscape$")
  "%(o?)xdvi %dS -paper a5r -s 0 %d")
 ("^dvi$" "^\\(?:a5\\(?:comb\\|paper\\)\\)$" "%(o?)xdvi %dS -paper a5 %d")
 ("^dvi$" "^b5paper$" "%(o?)xdvi %dS -paper b5 %d")
 ("^dvi$" "^letterpaper$" "%(o?)xdvi %dS -paper us %d")
 ("^dvi$" "^legalpaper$" "%(o?)xdvi %dS -paper legal %d")
 ("^dvi$" "^executivepaper$" "%(o?)xdvi %dS -paper 7.25x10.5in %d")
 ("^dvi$" "." "%(o?)xdvi %dS %d")
 ("^pdf$" "." "xdg-open %o")
 ("^html?$" "." "firefox %o"))

The  C-c C-v open gv file.dvi automatically. However, it always open with the first page. 
backward search fails too. Any help is appreciated. 

Shiyuan