laravel 6 Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes code example

Example 1: laravel migation error

use Illuminate\Support\Facades\Schema;

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

Example 2: schema error laravel

use Illuminate\Support\Facades\Schema;

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