Mage::getStoreConfig('Section/Group/Field') path not in core_config_data

Question

The error after turning developer mode back on is:

Fatal error: Call to a member function toOptionArray() on a non-object in /home/vimarket/public_html/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php on line 463

Within the system.xml of the extension, these fields are causing the issue:

<pixenable translate="label">
                      <label>Enable</label>
                      <frontend_type>select</frontend_type>
                      <source_model>adminhtml/system_config_source_yesno</source_model>
                      <sort_order>0</sort_order>
                      <show_in_default>1</show_in_default>
                      <show_in_website>1</show_in_website>
                      <show_in_store>1</show_in_store>
                                                    <comment>Activate this plugin</comment>
                  </pixenable>

                                    <tipe translate="label">
                      <label>Tracking Type</label>
                      <frontend_type>select</frontend_type>
                      <source_model>adminhtml/system_config_source_tracktype</source_model>
                      <sort_order>1</sort_order>
                      <show_in_default>1</show_in_default>
                      <show_in_website>1</show_in_website>
                      <show_in_store>1</show_in_store>
                    </tipe>

They're within the tags. So, the paths of these must not be there, but I can't figure out exactly where the paths should be.

Config.xml:

<?xml version="1.0"?>
<config>
 <modules>
    <PixelMarket_Pixel>
        <version>1.0.0</version>
    </PixelMarket_Pixel>
</modules>
<frontend>
    <routers>
        <pixel>
        <use>standard</use>
            <args>
              <module>PixelMarket_Pixel</module>
              <frontName>pixel</frontName>
            </args>
        </pixel>
    </routers>
        <layout>
            <updates>
                   <pixel>
                        <file>pixel.xml</file>
                   </pixel>
            </updates>
        </layout>
</frontend>
<global>
    <helpers>
        <pixel>
          <class>PixelMarket_Pixel_Helper</class>
        </pixel>
    </helpers>
      <blocks>
         <pixel>
               <class>PixelMarket_Pixel_Block</class>
         </pixel>
      </blocks>
      <models>
         <pixel>
               <class>PixelMarket_Pixel_Model</class>
                 <resourceModel>pixel_mysql4</resourceModel>
         </pixel>
         <pixel_mysql4>
               <class>PixelMarket_Pixel_Model_Mysql4</class>
                 <entities>
                        <reftable>
                                <table>reftable</table>
                        </reftable>
             </entities>
         </pixel_mysql4>
      </models>
      <resources>
         <pixel_setup>
               <setup>
                   <module>PixelMarket_Pixel</module>
               </setup>
               <connection>
                   <use>core_setup</use>
               </connection>
         </pixel_setup>
        <pixel_write>
              <connection>
                  <use>core_write</use>
              </connection>
        </pixel_write>
        <pixel_read>
              <connection>
                  <use>core_read</use>
              </connection>
        </pixel_read>
      </resources>
  </global>
  <admin>
       <routers>
          <pixel>
             <use>admin</use>
               <args>
                   <module>PixelMarket_Pixel</module>
                  <frontName>pixel</frontName>
               </args>
          </pixel>
       </routers>
  </admin>
  <adminhtml>
       <menu>
          <pixel module="pixel">
                <title>Pixel</title>
                <sort_order>100</sort_order>
                <children>
                    <reftable module="pixel">
                        <title>Manage Reftable</title>
                          <sort_order>0</sort_order>
                          <action>pixel/adminhtml_reftable</action>
                    </reftable>
                </children>
          </pixel>
      </menu>
       <acl>
          <resources>
                <all>
                    <title>Allow Everything</title>
                </all>
                <admin>
                    <children>
                           <pixel translate="title" module="pixel">
                                <title>Track Customer</title>
                                <sort_order>1000</sort_order>
                                   <children>
                                     <reftable translate="title">
                                            <title>Manage Tracker</title>
                                            <sort_order>0</sort_order>
                                     </reftable>
                                   </children>
                          </pixel>
                    </children>
                </admin>
          </resources>
        </acl>
        <layout>
           <updates>
                 <pixel>
                     <file>pixel.xml</file>
                 </pixel>
          </updates>
        </layout>
    </adminhtml>
</config>

Answer 1

The problem comes from:

 <source_model>adminhtml/system_config_source_tracktype</source_model>

This source model does not exist. There is also no other source model in the core, called "tracktype", so it's unclear to me what they are trying to do here. A custom source model should not be added to the Mage_Adminhtml namespace but to the extension namespace.

Conclusion: It's a bug in the extension, their system.xml is wrong.

Answer 2

You need to create Tracktype.php file into this file path Block/Adminhtml/System/Config/Tracktype.php

Add below code into system.xml file

                  <tipe translate="label">
                  <label>Tracking Type</label>
                  <frontend_type>select</frontend_type>
                  <frontend_model>YOURMODULENAME/adminhtml_system_config_source_tracktype</frontend_model>
                  <sort_order>1</sort_order>
                  <show_in_default>1</show_in_default>
                  <show_in_website>1</show_in_website>
                  <show_in_store>1</show_in_store>
                </tipe>