Why doesn't it find the namespace?

Question

Yii

I installed the extension on localhost. Then, in order not to transfer everything to a real server via FTP, I unloaded the extension folder. But now the error pops up is not visible class? Why ?

namespace mihaildev\elfinder;

use Yii;
use yii\base\Widget as BaseWidjet;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;
use yii\helpers\Json;

/**
 * Class Widget
 * @package mihaildev\elfinder
 */

class ElFinder extends BaseWidjet{

  public $language;

  public $filter;

use mihaildev\elfinder\ElFinder;

Answer 1

.text-left p {
margin: 0;
}