CodeIgniter and Oracle

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Oracle

Hi guys!

I am trying to add to oracle database using CodeIgniter.
Code below is the query to add to the database:

<?php <br mode="hold" /?>class System_model extends Model// this is the model class that all query statement are excecuted 
{
function insertNewNationality($nationality)
//function to add new nationality to the cvdb
{									//note: cvdb is the name of the database
$data=array('nationality'=&gt;$nationality);//column name in the nationality_ids table
$this-&gt;db-&gt;insert('nationality_ids',$data);//query statement to insert value to nationality_ids table the cvdb
}
?&gt;

When coding using CodeIgniter, normally we will have three different folders:
One is Controller another one is View and last one is Model. Model is where all query function are.

In my View when I try to add value to the oracle database i get this error:

A Database Error Occurred  
Error Number:INSERT INTO "gender_ids" ("gender") VALUES ('male')

Can anyone help me please :(