El-get安装失败

Question

我按照el-get github页面上的说明安装了el-get。

我将以下代码粘贴到暂存缓冲区中。

(url-retrieve
 "https://raw.github.com/dimitri/el-get/master/el-get-install.el"
 (lambda (s)
   (goto-char (point-max))
   (eval-print-last-sexp)))

我看到以下错误

Debugger entered--Lisp error: (void-variable read:errno=0)
  eval(read:errno=0)
  eval-last-sexp-1(t)
  eval-last-sexp(t)
  eval-print-last-sexp()
  (lambda (s) (goto-char (point-max)) (eval-print-last-sexp))(nil)
  apply((lambda (s) (goto-char (point-max)) (eval-print-last-sexp)) nil)
  url-http-activate-callback()
  url-http-end-of-document-sentinel(#<process raw.github.com> "finished\n")

有关如何调试/解决此问题的任何提示。