我有NVM 0.30.1，并用它在Fedora 22上安装了node.js v5.4.0（带有NPM 3.5.4），当我运行时npm update -g，收到以下警告：

npm WARN EBUNDLEOVERRIDE Replacing bundled npm > init-package-json with new installed version
npm WARN EBUNDLEOVERRIDE Replacing bundled npm > node-gyp with new installed version
npm WARN EBUNDLEOVERRIDE Replacing bundled npm > npm-install-checks with new installed version
npm WARN EBUNDLEOVERRIDE Replacing bundled npm > npmlog with new installed version
npm WARN EBUNDLEOVERRIDE Replacing bundled npm > read-package-json with new installed version

之后，当我运行npm时，出现此错误：

module.js:328
    throw err;
    ^

Error: Cannot find module 'npmlog'
    at Function.Module._resolveFilename (module.js:326:15)
    at Function.Module._load (module.js:277:25)
    at Module.require (module.js:354:17)
    at require (internal/module.js:12:17)
    at /home/peflorencio/.nvm/versions/node/v5.4.0/lib/node_modules/npm/bin/npm-cli.js:20:13
    at Object.<anonymous> (/home/peflorencio/.nvm/versions/node/v5.4.0/lib/node_modules/npm/bin/npm-cli.js:76:3)
    at Module._compile (module.js:398:26)
    at Object.Module._extensions..js (module.js:405:10)
    at Module.load (module.js:344:32)
    at Function.Module._load (module.js:301:12)

有谁知道这是什么以及如何解决？

谢谢