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I want to customize org-agenda-prefix-format before org agenda starts :

(add-to-list 'org-agenda-prefix-format '(todo . "  %b"))

But if I put the previous line in my .emacs.d, Emacs will show me this error:

Error (use-package): org :config: Symbol's value as variable is void: org-agenda-prefix-format

It seems that the variable is not defined before org agenda has been started once. How to solve this problem?

4

The problem is that org-agenda-prefix-format doesn't exist as a list so you can't add to it. You could define it:

(setq org-agenda-prefix-format '((todo . "  %b")))

But, really this variable isn't good for anything until org-agenda is loaded, so just tell Emacs to add-to-list, but not until org-agenda is loaded using with-eval-after-load

(with-eval-after-load 'org-agenda 
  (add-to-list 'org-agenda-prefix-format '(todo . "  %b"))

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