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Fatal error: Uncaught Error: Class 'yii\helpers\Html' not found in D:\phpStudy\WWW\Soeasy\vendor\yiisoft\yii2-gii\src\generators\extension\form.php:9 Stack trace: #0 {main} thrown in D:\phpStudy\WWW\Soeasy\vendor\yiisoft\yii2-gii\src\generators\extension\form.php on line 9