在网上看了一段代码加到init.el文件，然后ctrl c,c,j,提示invalid file location:nil. 这是哪个文件不存在？
(require 'org)
(global-set-key (kbd "C-c c") 'org-capture)
(setq org-default-notes-file "~/org/inbox.org")
(setq org-capture-templates
(quote (("i" "idea" entry (file (concat org-directory "home/unicorn/idea.org"))
"* %^{Title} %?\n%U\n%a\n")
("t" "todo" entry (file (concat org-directory "home/unicorn/gtd.org"))
"* TODO %?\n%U\n%a\n" :clock-in t :clock-resume t)
("n" "note" entry (file (concat org-directory "home/unicorn/note.org"))
"* %? :NOTE:\n%U\n%a\n" :clock-in t :clock-resume t)
("j" "Journal" entry (file+datetree (concat org-directory "home/unicorn/journal.org"))
"* %^{Title} %?\n%U\n%a\n" :clock-in t :clock-resume t)
("b" "Book" entry (file+datetree \t \t (concat org-directory "home/unicorn/book.org"))
"* Topic: %^{Description} %^g %? Added: %U"))))