How to check server 500 error in yii2

Server 500 error:

First open web/index.php defined('YII_DEBUG') or define('YII_DEBUG', true); change this to true; Take a look at the error reported

Exception (Invalid Configuration) 'yii\base\InvalidConfigException' with message 'The directory is not writable by the Web process: /home/wwwroot/1XX.2X.XX3. X2/xhedu/backend/web/assets'in /home/wwwroot/12X.2X.XXX.1X/xhedu/vendor/yiisoft/yii2/web/AssetManager.php:213

##assests file The folder and its files have insufficient permissions, resulting in the inability to access AssetManager.php. Change it to 777. The name of the owner and group of my previous project is www. The permissions are the maximum 777. The user name of the subsequent project is root. The permissions are not the maximum. All needs to be changed. Just change the project assets folder to 777.

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