specify category names rather than ids not working

[LouNik1984]

Hi,

I'm using this extension with magento 1.9 and everything works fine. If I add array of categories with their ids, the product is created correctly, but if I add an array of names, the product is created without any category associated to it. The code I'm using is:

$simple_data = array(
'categories' => array('Default Category', 'first subcategory'),
...
);