Important: what is this means CI_DB_oci8_driver::_protect_identifiers()

[eluser]Unknown[/eluser]

Code:

Fatal error: Call to undefined method CI_DB_oci8_driver::_protect_identifiers()
in
G:\xampp\htdocs\kerjaan\assessment\system\database\DB_active_rec.php on line 296

[eluser]TheFuzzy0ne[/eluser]
What version of CodeIgniter are you using? In the latest version, line 296 of DB_active_rec.php is:

Code:

* @param    string    the type of join