Error after install running org-wiki-index

[Donovan Nye]

I have created ~/org/wiki -- this exception is thrown. Seems to effect anything that attempts to read a file. I installed via the bootstrap method and then tried a manual install. No difference.

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
file-name-as-directory(nil)
org-wiki--page->file("index")
org-wiki--open-page("index")
org-wiki-index()
funcall-interactively(org-wiki-index)
call-interactively(org-wiki-index record nil)
command-execute(org-wiki-index record)
execute-extended-command(nil "org-wiki-index" "org-wiki-index")
funcall-interactively(execute-extended-command nil "org-wiki-index" "org-wiki-index")
call-interactively(execute-extended-command nil nil)
command-execute(execute-extended-command)

[Matthew E. Adams]

I also tried multiple forms of installation (bootstrap, manual) and am having same exception thrown.

Running Emacs 25.2 and org-mode version 9.2

[Aleksei I. Shupikov]

I have the same problem too.

Emacs 25.3.1 and Org mode version 9.1.1

[Miguel Faggioni]

I had the same issue, but it got fixed after I set the org-wiki-location in my .emacs file

(setq org-wiki-location "~/org/wiki")