create administrator user by run code in magento

Create a php file on magento root directory and run following code :-



<?php
require_once('app/Mage.php');
umask(0);
Mage::app();

$user = Mage::getModel('admin/user')->setData(array(
'username'  => 'admin1',
'firstname' => 'admin',
'lastname'    => 'ministrator',
'email'     => 'admin1@gmail.com',
'password'  =>'tm123456',
'is_active' => 1
))->save();
$user->setRoleIds(array(1))->setRoleUserId($user->getUserId())->saveRelations();

echo "User has been created successfully!";
?>
if  genrate an error :-
(error "parent role id 'G1' does not exist" on admin)

 then  below two query are run on db 


insert into admin_role values(1,0,1,1,'G',0,'Administrator');


insert into admin_rule values (8,1,'all',null,0,'G','allow');