In YII2, how to add a widget written by myself to the yii2 framework is shown in the figure for details.

  ios, question

![yii2配置][1]

The above is my configuration file, the error is not found. This class is in the folder: Project \ Components \ Stone.php.

Write wrong, first put him in the components directory.

Php'stone' => [
 'class' => 'app\components\Stone'
 bracket

You can then use yii::$app->stone