Here's the solution:

(defun my-org-files-list ()
  (delq nil
    (mapcar (lambda (buffer)
      (buffer-file-name buffer))
      (org-buffer-list 'files t))))

On Wed, May 4, 2016 at 1:20 PM, Peter Salazar <cycleofsong@gmail.com> wrote:

> Hello, I use org-refile quite a bit, but for my use-case, I want to refile
> my org-mode subtrees not to an org-agenda file, but to the current file or
> another file I'm currently visiting.
>
> I had a way of doing this that was working correctly, but now has stopped
> working. I'm not sure what I changed that broke it.
>
> Here's the code I'm using for org-refile:
>
> (setq org-outline-path-complete-in-steps nil) ; Refile in a single go
> (setq org-completion-use-ido nil)
> (setq org-refile-use-outline-path t) ; Show full paths for refiling
> (setq org-refile-allow-creating-parent-nodes (quote confirm)) ; allow
> refile to create parent tasks with confirmation
>
> (defun my-org-files-list ()
>  (mapcar (lambda (buffer)
>    (buffer-file-name buffer))
>    (org-buffer-list 'files t)))
>
> (setq org-refile-targets '((my-org-files-list :maxlevel . 3)))
>
> Again, this used to work. But now when I run org-refile, I get this:
>
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>   get-file-buffer(nil)
>   org-find-base-buffer-visiting(nil)
>   org-get-agenda-file-buffer(nil)
>   org-refile-get-targets(nil (#("this" 0 4 (fontified t face
> org-level-1))))
>   org-refile-get-location("Refile subtree \"this\" to" nil confirm nil)
>   org-refile(nil)
>   call-interactively(org-refile record nil)
>   command-execute(org-refile record)
>   execute-extended-command(nil "org-refile")
>   call-interactively(execute-extended-command nil nil)
>   command-execute(execute-extended-command)
>
> Any suggestions on how to fix this? Thanks!
>
>