public function __construct($command, \Exception $previous = NULL)
{
parent::__construct("The command {$command} could not be executed.", 0, $previous);
}
public function __construct(Errors $errors, array $values = array(), \Exception $previous = NULL)
{
parent::__construct("A validation exception occured.", static::$scope, $previous);
$this->setErrors($errors);
$this->setValues($values);
}