Support: error: Adding an item to an existing invoice

I get the following error on the basic demo data, when trying to add a new item to an existing invoice

Fatal error: Call to undefined function insertInvoiceItem() in C:\wamp\www\simpleinvoices\modules\invoices\add_invoice_item.php on line 21

Any ideas

Running
Winxp
Apache Version : 2.2.8 PHP Version : 5.2.6 MySQL Version : 5.0.51b


Thanks

thanks nilrem

good to hear its working ok now

cheers

justin