Oracle database error

[eluser]Unknown[/eluser]
Hello,

I ran into strange problem while trying to execute database query:

Code:

Fatal error: Call to undefined method Auth::_remove_invisible_characters() in /var/www/back/system/database/drivers/oci8/oci8_driver.php on line 378

The code is:

Code:

$this->DB = $this->DB=$this->load->database('sso', TRUE);
...
$this->DB->query('...')->result();

I Googled it and found nothing useful.