科尔多瓦构建失败，错误代码：EACCESS

$ cordova build android
Running command: /home/user/proj1/platforms/android/cordova/build 
execvp(): Permission denied
Error: /home/user/proj1/platforms/android/cordova/build: Command failed with exit code EACCES
    at ChildProcess.whenDone (/usr/lib/node_modules/cordova/node_modules/cordova-lib/src/cordova/superspawn.js:131:23)
    at ChildProcess.EventEmitter.emit (events.js:95:17)
    at Process.ChildProcess._handle.onexit (child_process.js:795:12)

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     OS  : Ubuntu 14.04
     npm version: 1.4.16
     cordova version : 3.5.0-0.2.4
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已将android平台添加到proj1 尝试重新安装，cordova但无法正常工作