Can't search

[squarepegsys]

I'm currently using Emacs Version 25.1 (9.0) installed via MacPorts.

I made a link in the index.org file at ~/org-wiki and put some content there. But whenever I try to search (with org-wiki-search or org-wiki-keywords) I get the following error:

grep-expand-template: Wrong type argument: stringp, nil

[padawanphysicist]

I suppose the reason is that org-wiki-search uses rgrep interactively. Using this in my init.el:

(eval-after-load "grep"
  '(grep-compute-defaults))

(found here) solved the problem.