使用cordova plugin 命令添加插件的時候，提示以下錯誤：
Running command - failed!
[ERROR] An error occurred while running cordova plugin add cordova-plugin-facebook4 --variable APP_ID=**
-... (exit code 1):
Installing "cordova-plugin-facebook4" for android
ANDROID_HOME=/Users/behrooz/Library/Android/sdk
JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home
Subproject Path: CordovaLib
Failed to install 'cordova-plugin-facebook4': Error: spawn EACCES
at exports._errnoException (util.js:1022:11)
at ChildProcess.spawn (internal/child_process.js:313:11)
at Object.exports.spawn (child_process.js:380:9)
at exports.spawn
(/Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/node_modules/cordova-common/src/superspawn.js:134:31)
at /Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/lib/builders/GradleBuilder.js:261:16
at _fulfilled (/Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/node_modules/q/q.js:854:54)
at self.promiseDispatch.done
(/Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/node_modules/q/q.js:883:30)
at Promise.promise.promiseDispatch
(/Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/node_modules/q/q.js:816:13)at /Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/node_modules/q/q.js:877:14
at runSingle (/Users/behrooz/git/Fitopedia/Fitopedia/platforms/android/cordova/node_modules/q/q.js:137:13)
Error: spawn EACCES
解決辦法：
chmod +x platforms/android/gradlew
