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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?
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"))
