Emacs:无法通过MELPA自动启动弹丸

我是emacs的新手.事实上,我正在学习编辑器并尝试设置一些可以复制"转到项目内部的文件"的功能,这些功能可以从Code :: Blocks或记事本++的某些插件中获知.

'projectile'满足了这个需求,我通过MELPA安装了它.正确安装包,因为我可以启动它M-x projectile-global-mode并C-c p识别命令.

但是,如果我将它放入我的.emacs文件中,Emacs会以错误开头:

Symbol's function definition is void: projectile-global-mode

我的.emacs文件内容如下:

(custom-set-variables
  ;; custom-set-variables was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.
  ;; Your init file should contain only one such instance.
  ;; If there is more than one, they won't work right.
 )
(custom-set-faces
  ;; custom-set-faces was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.
  ;; Your init file should contain only one such instance.
  ;; If there is more than one, they won't work right.
 )
(global-whitespace-mode 1)
(global-linum-mode 1)

(require 'package)
(add-to-list 'package-archives
  '("melpa" . "http://melpa.milkbox.net/packages/") t)

(projectile-global-mode 1)

当我(require 'projectile)第一次尝试时,我最终会遇到另一个错误:

 'File error: Cannot open load file, projectile'

我正在使用Emacs 24.3.1.

如何正确地将其置于自动启动？