npm安装grunt 报错TypeError: Object.keys called on non-object

npm install -g grunt-cli执行到 npm http GET http://registry.npmjs.org/lodash

npm http 304 http://registry.npmjs.org/inherits

npm http 304 http://registry.npmjs.org/sigmund这三个地方都提示! TypeError: Object.keys called on non-object ! at Function.keys (native) ! at c:\Program Files\nodejs\node_modules\npm\lib\build.js:111:18 ! at process._tickCallback (node.js:415:13) ! If you need help, you may report this log at: ! http://github.com/isaacs/npm/issues