Yii 2.0 Alpha To Yii 2.0 Beta Update Error

Yii 2.0 Alpha was working fine. When i updated alpha to beta via composer I got the below error messgage

Unknown Property – yii\base\UnknownPropertyException

Setting unknown property: yii\web\Application::preload

I Solved that error.

After commented the preload parameter, my app is working fine.

But i dont know Why it was showed error?


return [

/**	'preload' => [



	'modules' => [

		'debug' => [

			'class' => 'yii\debug\Module',




Because framework code changed. See new application templates code for details.