scope not found second time fileuploadchange, jquery-file-upload angularjs

Question

i am using jquery file upload with angular and it works great. I added my own callback on fileuploadchange, so when a user selects a different file, u get a callback. The upload form is in a overlay, that i close when the user is done. When a user wants to upload another image (that's where i use it form), the fileuploadchange reports a error

TypeError: data.scope is not a function 
var scope = data.scope();

The line it is refering to

add: function (e, data) {
  if (e.isDefaultPrevented()) {
      return false;
  }
  var scope = data.scope();    <----------------------------------
  data.process(function () {
    return scope.process(data);
  }).always(

I don't know why it is giving this error. When i console.log the data variable, the second time it is missing .scope() but i have no clue why.

Anyone got a suggestion? Thanks in advance!

-- additional info ---

The controller is set in the ng-view

<form id="fileupload" action="/api/profile/picture" method="POST" enctype="multipart/form-data" data-ng-controller="DemoFileUploadController" data-file-upload="options" data-ng-class="{'fileupload-processing': processing() || loadingFiles}" class="avatar">

and in the controller i have the following options

$scope.options = {
    url: '/api/userprofile/' + $rootScope.User.UserId + '/avatar/',
    type: 'POST'
};

The directives are a exact copy of the once in github, provided by blueimp, https://github.com/blueimp/jQuery-File-Upload/blob/master/js/jquery.fileupload-angular.js