vue-cli: `npm install -g vue-cli` is not working?

when I use npm install -g vue-cli, there are some errors and a warning.

npm WARN deprecated metalsmith-templates@0.7.0: This package was split into two simpler plugins: metalsmith-layouts and metalsmith-in-place
npm ERR! git -c core.longpaths=true clone --template=C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror http://github.com/ianstormtaylor/to-camel-case C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\http-github-com-ianstormtaylor-to-camel-case-f206d7eb
npm ERR! git clone --template=C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror http://github.com/ianstormtaylor/to-camel-case C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\http-github-com-ianstormtaylor-to-camel-case-f206d7eb: Cloning into bare repository 'C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\http-github-com-ianstormtaylor-to-camel-case-f206d7eb'...
npm ERR! git clone --template=C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror http://github.com/ianstormtaylor/to-camel-case C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\http-github-com-ianstormtaylor-to-camel-case-f206d7eb: fatal: Unable to find remote helper for 'http'
npm ERR! Windows_NT 6.3.9600
npm ERR! argv "D:\\Program Files\\nodejs\\\\node.exe" "D:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "vue-cli"
npm ERR! node v0.12.2
npm ERR! npm  v2.7.4
npm ERR! code 128

npm ERR! Command failed: git -c core.longpaths=true clone --template=C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\_templates --mirror http://github.com/ianstormtaylor/to-camel-case C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\http-github-com-ianstormtaylor-to-camel-case-f206d7eb
npm ERR! Cloning into bare repository 'C:\Users\admin\AppData\Roaming\npm-cache\_git-remotes\http-github-com-ianstormtaylor-to-camel-case-f206d7eb'...
npm ERR! fatal: Unable to find remote helper for 'http'
npm ERR!
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!     <https://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     E:\GitWorkSpace\learn-vue\npm-debug.log

So, how to do with this situation?