Integrating elFinder, TinyMCE to Laravel 5.1

I am using this package and somehow I am getting an error in the console. This is what js function in the document looks like:

function elFinderBrowser (field_name, url, type, win) {
  tinymce.activeEditor.windowManager.open({
    file: '<?= route('elfinder.tinymce4') ?>',// use an absolute path!
    title: 'elFinder 2.0',
    width: 900,
    height: 450,
    resizable: 'yes'
  }, {
    setUrl: function (url) {
      win.document.getElementById(field_name).value = url;
    }
  });
  return false;
}

This gives an error: Uncaught TypeError: a is not a function

via Chebli Mohamed