не работает виджет yii2 imperavi

вот документация - https://github.com/vova07/yii2-imperavi-widget

Нужно настроить загрузку файлов.

view:

<?= $form->field($model, 'text')->textArea(['id' => 'my-textarea-id']) ?>

<?php  \vova07\imperavi\Widget::widget([
  'selector' => '#my-textarea-id',
  'settings' => [
       'lang' => 'ru',
        'minHeight' => 200,
        'imageUpload' => Url::to(['/file-storage/default']),
           'plugins' => [
               'imagemanager',
            ],
    ],
]); ?>

так же создал контроллер : FileSorageController.php

и поместил в него:

<?php
namespace controllers;
use Yii;

/**
 * FileStorageController implements the CRUD actions for FileStorageItem model.
 */
class FileStorageController extends Controller
{

    public function actions()
{
    return [
        'image-upload' => [
            'class' => 'vova07\imperavi\actions\UploadFileAction',
            'url' => 'http://umonreal.ru/file-storage/', // Directory URL address, where files are stored.
            'path' => '/file-storage', // Or absolute path to directory where files are stored.
        ],
    ];
}
}

Ошибка:

An error occurred during the upload process!

логи:

<pre>PHP Fatal Error &#039;yii\base\ErrorException&#039; with message &#039;Class &#039;controllers\Controller&#039; not found&#039; 
in /home/d/davgabih/team.umonreal.ru/public_html/controllers/StorageController.php:12
Stack trace:
#0 [internal function]: yii\base\ErrorHandler-&gt;handleFatalError()
#1 {main}</pre>