System.xml "select" with a custom Model not working

Question

app\code\local\Jurgis\Twilio\etc\system.xml

<language translate="label">
 <label>Voice Language</label>
 <frontend_type>select</frontend_type>
 <source_model>Twilio/Language</source_model>
 <sort_order>92</sort_order>
 <show_in_default>1</show_in_default>
 <show_in_website>1</show_in_website>
 <show_in_store>1</show_in_store>
</language>

app\code\local\Jurgis\Twilio\etc\config.xml

<?xml version="1.0"?>
<config>
 <modules>
 <Jurgis_Twilio>
 <version>1.0.0</version>
 </Jurgis_Twilio>
 </modules>
 <global>
 <helpers>
 <Jurgis_Twilio>
 <class>Jurgis_Twilio_Helper</class>
 </Jurgis_Twilio>
 </helpers>
 <models>
 <Jurgis_Twilio>
 <class>Jurgis_Twilio_Model</class>
 </Jurgis_Twilio>
 </models>
 </global>

app\code\local\Jurgis\Twilio\Model\Language.php

<?php
class Jurgis_Twilio_Model_Language
{
 public function toOptionArray()
 {
 return array(
 array(
 'value' => 'key1',
 'label' => 'Value 1',
 ),
 array(
 'value' => 'key2',
 'label' => 'Value 2',
 ),
 );
 }
}

When I go to my admin config, I get the error:

Fatal error: Call to a member function toOptionArray() on boolean in ...\app\code\core\Mage\Adminhtml\Block\System\Config\Form.php on line 463

• pip: Looks like it can't find you source model, which points to incorrect config.xml configuration me thinks. Also maybe cache. Can you add your config.xml?
• Metal Mathematician: Added config.xml

Answer 1

change this

 <source_model>Twilio/Language</source_model>

to this

 <source_model>Jurgis_Twilio/Language</source_model>