make sure step by step but it's not working. I saw error below:
Minifying JS file: ._ion.sound.js
/Users/phanthinh/Public/Projects/buddy/build/***/node_modules/uglify-js/tools/node.js:57
files.forEach(function(file, i){
^
TypeError: Cannot read property 'forEach' of undefined
at Object.exports.minify (/Users/***/Public/Projects/buddy/build/***/node_modules/uglify-js/tools/node.js:57:14)
at compress (/Users/***/Public/Projects/***/build/buddy/hooks/after_prepare/ionic-minify.js:63:29)
at /Users/***/Public/Projects/buddy/build/***/hooks/after_prepare/ionic-minify.js:119:11
at FSReqWrap.oncomplete (fs.js:82:15)
Error: Hook failed with error code 1: /Users/***/Public/Projects/buddy/build/buddy/hooks/after_prepare/ionic-minify.js
at /usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:195:23
at rejected (/usr/local/lib/nodemodules/cordova/node_modules/q/q.js:797:24)
at /usr/local/lib/node_modules/cordova/node_modules/q/q.js:823:30
at Promise.when (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:1035:31)
at Promise.promise.promiseDispatch (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:741:41)
at /usr/local/lib/node_modules/cordova/node_modules/q/q.js:557:44
at flush (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:108:17)
at doNTCallback0 (node.js:408:9)
at process._tickCallback (node.js:337:13)