<?php defined('SYSPATH') OR die('No direct script access.');

abstract class Koi extends Kohana_Koi {
	// @see Kohana_Koi
}
<?php defined('SYSPATH') OR die('No direct script access.');

class Koi extends Kohana_Koi {
	// @see Kohana_Koi
}
Remove abstract from Koi class
Remove abstract from Koi class
