关于自动完成：Emacs 自动完成错误：Symbol 的值作为变量是 void:ac-modes

Emacs auto-complete error: Symbol's value as variable is void: ac-modes

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我正在尝试安装 emacs latex 自动完成包 (http://code.google.com/p/ac-math/)。我将 ac-math.el 放入 ~/elisp 加载路径目录，然后将以下内容放入我的 .emacs 文件中：

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;; Adds elisp to load-path
(add-to-list 'load-path"~/elisp")

;; Loads latex auto-complete
(require 'ac-math)
(add-to-list 'ac-modes 'latex-mode)
(defun ac-latex-mode-setup ()
(setq ac-sources
(append '(ac-source-math-latex ac-source-latex-commands ac-source-math-unicode)
ac-sources))
)
(add-hook 'LaTeX-mode-hook 'ac-latex-mode-setup)

但是当我加载 emacs 时，我得到了这个错误：

Warning (initialization): An error occurred while loading
`/home/eddy/.emacs':

Symbol's value as variable is void: ac-modes

To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file. Start Emacs with the
`--debug-init' option to view a complete error backtrace.

提前致谢