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fix my website Can't retrieve entity config: core/store_group Trace: #0 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](282): Mage::throwException('Can't retrieve ...') #1 /home/pgadget/public_html/app/code/core/Mage/Core/Model/Resource/Db/[login to view URL](284): Mage_Core_Model_Resource->getTableName('core/store_grou...') #2 /home/pgadget/public_html/app/code/core/Mage/Core/Model/Resource/Db/[login to view URL](247): Mage_Core_Model_Resource_Db_Abstract->getTable('store_group') #3 /home/pgadget/public_html/app/code/core/Mage/Core/Model/Resource/Db/Collection/[login to view URL](155): Mage_Core_Model_Resource_Db_Abstract->getMainTable() #4 /home/pgadget/public_html/app/code/core/Mage/Core/Model/Resource/Db/Collection/[login to view URL](192): Mage_Core_Model_Resource_Db_Collection_Abstract->getMainTable() #5 /home/pgadget/public_html/app/code/core/Mage/Core/Model/Resource/Db/Collection/[login to view URL](135): Mage_Core_Model_Resource_Db_Collection_Abstract->_initSelect() #6 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](1354): Mage_Core_Model_Resource_Db_Collection_Abstract->__construct(Object(Mage_Core_Model_Resource_Store_Group)) #7 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](1386): Mage_Core_Model_Config->getModelInstance('core_resource/s...', Object(Mage_Core_Model_Resource_Store_Group)) #8 /home/pgadget/public_html/app/[login to view URL](491): Mage_Core_Model_Config->getResourceModelInstance('core/store_grou...', Object(Mage_Core_Model_Resource_Store_Group)) #9 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](208): Mage::getResourceModel('core/store_grou...', Object(Mage_Core_Model_Resource_Store_Group)) #10 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](213): Mage_Core_Model_Abstract->getResourceCollection() #11 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](624): Mage_Core_Model_Abstract->getCollection() #12 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](477): Mage_Core_Model_App->_initStores() #13 /home/pgadget/public_html/app/code/core/Mage/Core/Model/[login to view URL](360): Mage_Core_Model_App->_initCurrentStore('', 'store') #14 /home/pgadget/public_html/app/[login to view URL](684): Mage_Core_Model_App->run(Array) #15 /home/pgadget/public_html/[login to view URL](83): Mage::run('', 'store') #16 {main}