error with gulp-ng-annoate, couldn't process source due to parse error

问题

I am getting trouble with error that is generated with gulp-ng-annoate.

Error message is

Error: app.js: error: couldn't process source due to parse error

I've found the other thread which seems to have same problem with me but that answer does not work for me. the other thread

Here is my gulp file and the files that I am trying to execute the tasks.

gulpfile.js

var gulp = require('gulp')
var concat = require('gulp-concat')
//var uglify = require('gulp-uglify')
var ngAnnotate = require('gulp-ng-annotate')

gulp.task('js', function(){
    gulp.src(['ng/module.js', 'ng/**/*.js'])
        .pipe(concat('app.js'))
        .pipe(ngAnnotate())
        //.pipe(uglify())
        .pipe(gulp.dest('assets'))
})

and files that I am trying to concat/ngAnnotate

module.js

angular.module('app', [])

posts.ctrl.js

angular.module('app')
.controller('PostCtrl', function($scope, PostsSvc){
    $scope.addPost = function(){
        if ($scope.postBody){
            PostsSvc.create({
                username: 'dickeyxxx',
                body: $scope.postBody
            }).success(function(post){
                $scope.posts.unshift(post)
                $scope.postBody = null
            })
        }
    }

    PostsSvc.fetch().success(function(posts){
        $scope.posts = posts
    })
})

posts.svc.js

angular.module('app')
.service('PostsSvc', ['$http', function ($http){
    this.fetch = function(){
        return $http.get('/api/posts')
    }
    this.create = function(post){
        return $http.post('/api/posts', post)
    }
}])

What could have gone wrong..?