access violation: 1071 Specified key was too long; max key length is 767 bytes laravel code example

Example 1: ERROR 1071 (42000) at line 76: Specified key was too long; max key length is 767 bytes laravel

use Illuminate\Support\Facades\Schema;

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

Example 2: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes (SQL: alter table `users` add index `users_userable_type_userable_id_index`(`userable_type`, `userable_id`)

Update your /app/Providers/AppServiceProvider.php to contain:

use Illuminate\Support\Facades\Schema;

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    Schema::defaultStringLength(191);
}