problems with initial downloading according to emacs wiki

[Sergio]

after

M-x web-vcs-nxhtml

I keep getting

ugger entered--Lisp error: (wrong-type-argument stringp nil)
  file-name-directory(nil)
  (let* ((this-dir ...) (root-url ...) (files ...) (files2 ...) need-dl) (dolist (file files2) (unless ... ...)) (when need-dl (let ... ...)) (message nil) (unless (get-buffer-window "*Messages*") (web-vcs-display-messages t) (delete-other-windows)) (dolist (file files2) (unless ... ...)) (load (cdr ...)))
  (catch (quote command-level) (setq debug-on-error t) (let* (... ... ... ... need-dl) (dolist ... ...) (when need-dl ...) (message nil) (unless ... ... ...) (dolist ... ...) (load ...)) (call-interactively (quote nxhtml-setup-install)))
  web-vcs-nxhtml()
  call-interactively(web-vcs-nxhtml t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)

[Sergio (cheko-c)]

I have Emacs 23.1