mac系统sudo week create weexproject创建项目报错Cannot find module 'commander'，从windows拷贝一个能用创建好的项目过来运行项目week run iOS 也报同样的错

sudo weex create weex-study2
Password:
module.js:549

throw err;
^

Error: Cannot find module 'commander'

at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/Users/yuanhl/.xtoolkit/node_modules/weexpack/bin/weexpack-create.js:3:17)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Command.immediateStart (/usr/local/lib/node_modules/weex-toolkit/node_modules/xtoolkit/lib/Command.js:103:5)
at Command._invoke (/usr/local/lib/node_modules/weex-toolkit/node_modules/xtoolkit/lib/Command.js:81:14)
at Command.run (/usr/local/lib/node_modules/weex-toolkit/node_modules/xtoolkit/lib/Command.js:53:12)
at XToolkit._runCmd (/usr/local/lib/node_modules/weex-toolkit/node_modules/xtoolkit/lib/xtoolkit.js:179:27)
at XToolkit._done (/usr/local/lib/node_modules/weex-toolkit/node_modules/xtoolkit/lib/xtoolkit.js:196:12)
at process.nextTick (/usr/local/lib/node_modules/weex-toolkit/node_modules/xtoolkit/lib/xtoolkit.js:131:14)
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)
at Function.Module.runMain (module.js:695:11)
at startup (bootstrap_node.js:191:16)