npm instal -g yo之后，yo -v throw err

ryan-Mac:~ ryan$ yo -v

/usr/local/lib/node_modules/yo/node_modules/configstore/node_modules/mkdirp/index.js:89

                    throw err0;

                          ^

Error: EACCES, permission denied '/Users/ryan/.config/configstore'

    at Error (native)

    at Object.fs.mkdirSync (fs.js:747:18)

    at Function.sync (/usr/local/lib/node_modules/yo/node_modules/configstore/node_modules/mkdirp/index.js:70:13)

    at Object.create.all.get (/usr/local/lib/node_modules/yo/node_modules/configstore/index.js:41:13)

    at Object.Configstore (/usr/local/lib/node_modules/yo/node_modules/configstore/index.js:27:44)

    at new Insight (/usr/local/lib/node_modules/yo/node_modules/insight/lib/index.js:36:34)

    at Object.<anonymous> (/usr/local/lib/node_modules/yo/lib/cli.js:117:15)

    at Module._compile (module.js:460:26)

    at Object.Module._extensions..js (module.js:478:10)

    at Module.load (module.js:355:32)

帮助解决一下吧。