brew mirror-check wget fail

gistfile1.txt

brew mirror-check wget
==> Testing mirrors for wget
==> Downloading http://ftp.gnu.org/gnu/wget/wget-1.13.4.tar.bz2
Warning: Failed to create the file 
Warning: /Library/Caches/Homebrew/wget-1.13.4.tar.bz2: No such file or 
Warning: directory
                                                                           0,1%
curl: (23) Failed writing body (0 != 1183)
Error: uninitialized constant Formula::DownloadError
Please report this bug:
    https://github.com/mxcl/homebrew/wiki/reporting-bugs
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:15:in `test_mirror'
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:47:in `check_mirrors'
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:47:in `each'
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:47:in `check_mirrors'
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:41:in `each'
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:41:in `check_mirrors'
/usr/local/Library/Contributions/cmds/brew-mirror-check.rb:55
/usr/local/bin/brew:47:in `require'
/usr/local/bin/brew:47:in `require?'
/usr/local/bin/brew:80