修改.emacs时Emacs启动错误

我刚接触Emacs。我正在尝试为python设置它,使用 this guide . 它建议的第一步是将以下内容添加到 init.el :

;; init.el --- Emacs configuration

;; INSTALL PACKAGES
;; --------------------------------------

(require 'package)

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

(package-initialize)
(when (not package-archive-contents)
  (package-refresh-contents))

(defvar myPackages
  '(better-defaults
    material-theme))

(mapc #'(lambda (package)
    (unless (package-installed-p package)
      (package-install package)))
      myPackages)

;; BASIC CUSTOMIZATION
;; --------------------------------------

(setq inhibit-startup-message t) ;; hide the startup message
(load-theme 'material t) ;; load material theme
(global-linum-mode t) ;; enable line numbers globally

;; init.el ends here

因为我有一个 .emacs 文件,我试着把它附加在那个文件上。之后,我的 Emacs 看起来像:

(require 'package)
(setq package-archives '(("gnu" . "http://elpa.gnu.org/packages/")
                         ("marmalade" . "http://marmalade-repo.org/packages/")
                         ("melpa" . "http://melpa.milkbox.net/packages/")))
(package-initialize)
(when (not package-archive-contents) (package-refresh-contents))

(let ((default-directory "~/.emacs.d/elpa/"))
    (normal-top-level-add-to-load-path '("."))
    (normal-top-level-add-subdirs-to-load-path))
(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.
 )

;; init.el --- Emacs configuration

;; INSTALL PACKAGES
;; --------------------------------------



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

(package-initialize)
(when (not package-archive-contents)
  (package-refresh-contents))

(defvar myPackages
  '(better-defaults
    material-theme))

(mapc #'(lambda (package)
    (unless (package-installed-p package)
      (package-install package)))
      myPackages)

;; BASIC CUSTOMIZATION
;; --------------------------------------

(setq inhibit-startup-message t) ;; hide the startup message
(load-theme 'material t) ;; load material theme
(global-linum-mode t) ;; enable line numbers globally

;; init.el ends here

但是,这会引发错误:

Warning (initialization): An error occurred while loading ‘/Users/adamg/.emacs’:

File error: http://melpa.org/packages/better-defaults-20160601.1219.el, Not found

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.

正在运行 emacs --debug-init 返回:

Debugger entered--Lisp error: (file-error "http://melpa.org/packages/better-defaults-20160601.1219.el" "Not found")
  signal(file-error ("http://melpa.org/packages/better-defaults-20160601.1219.el" "Not found"))
  package-install-from-archive(#s(package-desc :name better-defaults :version (20160601 1219) :summary "Fixing weird quirks and poor defaults" :reqs nil :kind single :archive "melpa" :dir nil :extras ((:url . "https://github.com/technomancy/better-defaults") (:keywords "convenience")) :signed nil))
  mapc(package-install-from-archive (#s(package-desc :name better-defaults :version (20160601 1219) :summary "Fixing weird quirks and poor defaults" :reqs nil :kind single :archive "melpa" :dir nil :extras ((:url . "https://github.com/technomancy/better-defaults") (:keywords "convenience")) :signed nil)))
  package-download-transaction((#s(package-desc :name better-defaults :version (20160601 1219) :summary "Fixing weird quirks and poor defaults" :reqs nil :kind single :archive "melpa" :dir nil :extras ((:url . "https://github.com/technomancy/better-defaults") (:keywords "convenience")) :signed nil)))
  package-install(better-defaults)
  (if (package-installed-p package) nil (package-install package))
  (lambda (package) (if (package-installed-p package) nil (package-install package)))(better-defaults)
  mapc((lambda (package) (if (package-installed-p package) nil (package-install package))) (better-defaults material-theme))
  eval-buffer(#<buffer  *load*> nil "/Users/adamg/.emacs" nil t)  ; Reading at buffer position 1437
  load-with-code-conversion("/Users/adamg/.emacs" "/Users/adamg/.emacs" t t)
  load("~/.emacs" t t)
  #f(compiled-function () #<bytecode 0x400d3941>)()
  command-line()
  normal-top-level()

当我把上面的代码放在一个单独的 初始EL 文件,它不会引发错误,但也不会更改启动屏幕或主题。有人能指出我做错了什么吗?