Indexer model is not defined.

Trace:
#0 E:\xampp\htdocs\magentoStore\includes\src\Mage_Index_Model_Process.php(310): Mage::throwException('Indexer model i...')
#1 E:\xampp\htdocs\magentoStore\includes\src\Mage_Index_Block_Adminhtml_Process_Grid.php(78): Mage_Index_Model_Process->getIndexer()
#2 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Widget_Grid.php(534): Mage_Index_Block_Adminhtml_Process_Grid->_afterLoadCollection()
#3 E:\xampp\htdocs\magentoStore\includes\src\Mage_Index_Block_Adminhtml_Process_Grid.php(64): Mage_Adminhtml_Block_Widget_Grid->_prepareCollection()
#4 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Widget_Grid.php(626): Mage_Index_Block_Adminhtml_Process_Grid->_prepareCollection()
#5 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Widget_Grid.php(632): Mage_Adminhtml_Block_Widget_Grid->_prepareGrid()
#6 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2540): Mage_Adminhtml_Block_Widget_Grid->_beforeToHtml()
#7 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2260): Mage_Core_Block_Abstract->toHtml()
#8 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2204): Mage_Core_Block_Abstract->_getChildHtml('grid', true)
#9 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Widget_Grid_Container.php(77): Mage_Core_Block_Abstract->getChildHtml('grid')
#10 E:\xampp\htdocs\magentoStore\app\design\adminhtml\default\default\template\widget\grid\container.phtml(36): Mage_Adminhtml_Block_Widget_Grid_Container->getGridHtml()
#11 E:\xampp\htdocs\magentoStore\includes\src\__default.php(3336): include('E:\xampp\htdocs...')
#12 E:\xampp\htdocs\magentoStore\includes\src\__default.php(3367): Mage_Core_Block_Template->fetchView('adminhtml\defau...')
#13 E:\xampp\htdocs\magentoStore\includes\src\__default.php(3381): Mage_Core_Block_Template->renderView()
#14 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Template.php(81): Mage_Core_Block_Template->_toHtml()
#15 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Widget_Container.php(308): Mage_Adminhtml_Block_Template->_toHtml()
#16 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2541): Mage_Adminhtml_Block_Widget_Container->_toHtml()
#17 E:\xampp\htdocs\magentoStore\includes\src\__default.php(13451): Mage_Core_Block_Abstract->toHtml()
#18 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2541): Mage_Core_Block_Text_List->_toHtml()
#19 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2260): Mage_Core_Block_Abstract->toHtml()
#20 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2204): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#21 E:\xampp\htdocs\magentoStore\app\design\adminhtml\default\default\template\page.phtml(74): Mage_Core_Block_Abstract->getChildHtml('content')
#22 E:\xampp\htdocs\magentoStore\includes\src\__default.php(3336): include('E:\xampp\htdocs...')
#23 E:\xampp\htdocs\magentoStore\includes\src\__default.php(3367): Mage_Core_Block_Template->fetchView('adminhtml\defau...')
#24 E:\xampp\htdocs\magentoStore\includes\src\__default.php(3381): Mage_Core_Block_Template->renderView()
#25 E:\xampp\htdocs\magentoStore\includes\src\Mage_Adminhtml_Block_Template.php(81): Mage_Core_Block_Template->_toHtml()
#26 E:\xampp\htdocs\magentoStore\includes\src\__default.php(2541): Mage_Adminhtml_Block_Template->_toHtml()
#27 E:\xampp\htdocs\magentoStore\includes\src\__default.php(27704): Mage_Core_Block_Abstract->toHtml()
#28 E:\xampp\htdocs\magentoStore\includes\src\__default.php(13844): Mage_Core_Model_Layout->getOutput()
#29 E:\xampp\htdocs\magentoStore\app\code\core\Mage\Index\controllers\Adminhtml\ProcessController.php(55): Mage_Core_Controller_Varien_Action->renderLayout()
#30 E:\xampp\htdocs\magentoStore\includes\src\__default.php(13872): Mage_Index_Adminhtml_ProcessController->listAction()
#31 E:\xampp\htdocs\magentoStore\includes\src\__default.php(18234): Mage_Core_Controller_Varien_Action->dispatch('list')
#32 E:\xampp\htdocs\magentoStore\includes\src\__default.php(17768): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#33 E:\xampp\htdocs\magentoStore\includes\src\__default.php(20368): Mage_Core_Controller_Varien_Front->dispatch()
#34 E:\xampp\htdocs\magentoStore\app\Mage.php(683): Mage_Core_Model_App->run(Array)
#35 E:\xampp\htdocs\magentoStore\index.php(88): Mage::run('', 'store')
#36 {main}

To see whats wrong with the system:

Open the page:

includes\src\Mage_Index_Model_Process.php

In the function “public function getIndexer()”, find the below line:

Mage::throwException(Mage::helper('index')->__('Indexer model is not defined.'));

Add add this debug line, just before the line:

echo $code;exit;

and try to access the index page again. This should show you the module or reason which is creating problems. Look specially in the extensions that you recently installed.

Please post you comments in case you face any issue.

Indexer model is not defined.

Indexer model is not defined.

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