problem with loading model - please help

[eluser]Zion.b.y[/eluser]
hello all,

i have been working at my home on somthing and everything was working fine,
when i moved my project (all the sources files) to other pc
i am getting the next error when i try to load my site

db->query($sql); return $query->result(); } }
Fatal error: Class 'Login_model' not found in C:\wamp\www\system\libraries\Loader.php on line 184


for some reason the error is in the line
$this->load->model('login_model');

the controller does not want to load the model

the whole constractor looks like that:

function login_handler()
{
parent::Controller();
$this->load->database();
$this->load->model('login_model');
$this->load->helper('url');
session_start();
}


please help,

thanks,
Zion