*Backtrace*.txt

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 (#("tinyhabits" 0 10 (fontified t face org-level-1 line-prefix nil wrap-prefix #("  " 0 2 (face org-indent))))))
  org-refile-get-location("Refile subtree \"tinyhabits\" to" nil confirm nil)
  org-refile(nil)
  #<subr call-interactively>(org-refile record nil)
  ad-Advice-call-interactively(#<subr call-interactively> org-refile record nil)
  apply(ad-Advice-call-interactively #<subr call-interactively> (org-refile record nil))
  call-interactively(org-refile record nil)
  command-execute(org-refile record)
  execute-extended-command(nil "org-refile")
  smex-read-and-run(("edit-abbrevs" "org-reload" "comment-region" "package-list-packages" "package-install" "org-mode" "prelude-delete-file-and-buffer" "workflowy-mode" "writeroom-mode" "tiny-expand" "customize-group" "reveal-in-finder" "org-priority" "rgrep" "jd-org-today" "customize-face" "mu4e" "gnus" "boss-mode" "mime-send-mail" "olivetti-mode" "transparent-serenity" "wc-mode" "org-bullets-mode" "org-refile-region" "eshell" "monaco-font" "email-heading" "org-mime-htmlize" "path-copy-full-path-to-clipboard" "org-refile" "shut-the-fuck-up" "gnugol" "zenburn" "smart-expand" "emacs-lisp-mode" "small-type" "abbrev-mode" "medium-type" "web-research" "package-refresh-contents" "auto-capitalize-mode" "transparency-set-value" "org-clone-subtree-with-time-shift" "notmuch" "load-theme" "lucida-font" "poetry-mode" "prelude-update" "rainy-highway-mode" ...))
  smex()
  #<subr call-interactively>(smex nil nil)
  ad-Advice-call-interactively(#<subr call-interactively> smex nil nil)
  apply(ad-Advice-call-interactively #<subr call-interactively> (smex nil nil))
  call-interactively(smex nil nil)
  command-execute(smex)