ckeditor field not working

[jakubwalawender]

I am trying to use ckeditor field like this:

$this->crud->addfield([
    'label' => "Description",
    'type' => 'ckeditor',
    'name' => 'description',
]);

The field is not rendering and in console i am getting this error:

What may cause the problem?

[jakubwalawender]

In my app.js file i had:
window.$ = window.jQuery = require('jquery');

After removing everything works as expected.