我正在运行npm安装，但它给了我一个错误.我还try 在更新之前运行下面的命令$npm安装npm，我也更新了优雅的fs.
$ npm install -g graceful-fs
graceful-fs@4.1.3 C:\Users\RDY672\AppData\Roaming\npm\node_modules\graceful-fs
错误如下:
$ npm install -g bower@1.3.12
npm WARN deprecated graceful-fs@3.0.8: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible.
npm WARN deprecated graceful-fs@2.0.3: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible.
npm WARN deprecated npmconf@2.1.2: this package has been reintegrated into npm and is now out of date with respect to npm
npm ERR! cb() never called!
npm ERR! not ok code 0