I just bougth a stronger pc, installed composer and wanted to continue my project on it but when I use gii it give me this error. How can I fix it ? Why am I getting it ? Th
solved. since 2.0.13, the class name Object is invalid in PHP 7.2,
//Replace //class User extends \yii\base\Object implements \yii\web\IdentityInterface
class User extends \yii\base\BaseObject implements \yii\web\IdentityInterface
And Download the yii-basic-app-2.0.25 from https://www.yiiframework.com/download after that copy the yiisoft folder from vendor and replace the yiisoft folder in your project in vendor folder
Now check your project will be working fine. Its work for me hope it will work for you.