Laravel, execute PHP artist migrate and report an error alter table `users`add unique `users_ email_ unique`(`email`))

Method 1

modify config/database.php file , Keyword search ： utf8mb4 Replace with utf8 That's all right. .

Method 2

modify app/Providers/AppServiceProvider.php file ：

use Illuminate\Support\Facades\Schema;

public function boot()
{
    
    Schema::defaultStringLength(191);
}

···
Laravel The pit encountered by the project ：alter table users add unique users_email_unique(email))