[Orgmode] Docbook export error...

[Madhu Rao]

Hi, I get this when I try exporting to docbook. Could you please help?

Debugger entered--Lisp error: (wrong-type-argument commandp org-export- 
as-docbook)
  call-interactively(org-export-as-docbook)
  (if (and bg (nth 2 ass) (not ...) (not ...)) (let (...) (set- 
process-sentinel p ...) (message "Background process \"%s\": started"  
p)) (call-interactively (nth 1 ass)))
  (let* ((bg ...) (help "[t]   insert the export option template 
\n[v]   limit export to visible part of outline tree\n\n[a] export as  
ASCII   [A] to temporary buffer\n\n[h] export as HTML    [H] to  
temporary buffer   [R] export region\n[b] export as HTML and open in  
browser\n\n[l] export as LaTeX   [L] to temporary buffer\n[p] export  
as LaTeX and process to PDF\n[d] export as LaTeX, process to PDF, and  
open the resulting PDF document\n\n[D] export as DocBook\n[V] export  
as DocBook, process to PDF, and open the resulting PDF document\n\n[x]  
export as XOXO\n\n[i] export current file as iCalendar file\n[I]  
export all agenda files as iCalendar files\n[c] export agenda files  
into combined iCalendar file\n\n[F] publish current file          [P]  
publish current project\n[X] publish a project...          [E] publish  
every projects") (cmds ...) r1 r2 ass) (save-excursion (save-window- 
excursion ... ... ... ... ...)) (setq r2 (if ... ... r1)) (unless  
(setq ass ...) (error "No command associated with key %c" r1)) (if  
(and bg ... ... ...) (let ... ... ...) (call-interactively ...)))
  org-export(nil)
  call-interactively(org-export)