my working site got down last day. I found this problem in reports. I believe there must be a quick fix of this issue. I would highly appreciate any kind of help, clue, hint to fix this issue. Thanks.
a:5:{i:0;s:79:"You cannot define a correlation name 'enable_googlecheckout_idx' more than once";i:1;s:3056:"#0 /var/www/lib/Varien/Db/Select.php(281): Zend_Db_Select->_join('inner join', Array, 'enable_googlech...', Array, NULL)
#1 /var/www/lib/Zend/Db/Select.php(336): Varien_Db_Select->_join('inner join', Array, 'enable_googlech...', Array, NULL)
#2 /var/www/lib/Zend/Db/Select.php(315): Zend_Db_Select->joinInner(Array, 'enable_googlech...', Array, NULL)
#3 /var/www/app/code/core/Mage/Catalog/Model/Resource/Layer/Filter/Attribute.php(70): Zend_Db_Select->join(Array, 'enable_googlech...', Array)
#4 /var/www/app/code/core/Mage/Catalog/Model/Layer/Filter/Attribute.php(94): Mage_Catalog_Model_Resource_Layer_Filter_Attribute->applyFilterToCollection(Object(Mage_CatalogSearch_Model_Layer_Filter_Attribute), '1')
#5 /var/www/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(91): Mage_Catalog_Model_Layer_Filter_Attribute->apply(Object(Mage_Core_Controller_Request_Http), Object(Mage_CatalogSearch_Block_Layer_Filter_Attribute))
#6 /var/www/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(73): Mage_Catalog_Block_Layer_Filter_Abstract->_initFilter()
#7 /var/www/app/code/core/Mage/Catalog/Block/Layer/View.php(136): Mage_Catalog_Block_Layer_Filter_Abstract->init()
#8 /var/www/app/code/core/Mage/Core/Block/Abstract.php(238): Mage_Catalog_Block_Layer_View->_prepareLayout()
#9 /var/www/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#10 /var/www/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('catalogsearch/l...', 'catalogsearch.l...')
#11 /var/www/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('catalogsearch/l...', 'catalogsearch.l...')
#12 /var/www/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#13 /var/www/app/code/core/Mage/Core/Model/Layout.php(210): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#14 /var/www/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#15 /var/www/app/code/core/Mage/Core/Controller/Varien/Action.php(269): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#16 /var/www/app/code/core/Mage/CatalogSearch/controllers/ResultController.php(77): Mage_Core_Controller_Varien_Action->loadLayout()
#17 /var/www/app/code/core/Mage/Core/Controller/Varien/Action.php(419): Mage_CatalogSearch_ResultController->indexAction()
#18 /var/www/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('index')
#19 /var/www/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#20 /var/www/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#21 /var/www/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#22 /var/www/index.php(87): Mage::run('website_dk', 'website')
#23 {main}";s:3:"url";s:114:"/catalogsearch/result/index/?dir=asc&enable_googlecheckout=1&mode=list&order=relevance&price=600-700&q=clip+on+tes";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:6:"danish";}