Magento Commerce

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Can't retrieve entity config: core/store_group
Trace:
#0 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Resource.php(140): Mage::throwException('Can't retrieve ...')
#1 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Mysql4/Abstract.php(228): Mage_Core_Model_Resource->getTableName('core/store_grou...')
#2 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Mysql4/Abstract.php(211): Mage_Core_Model_Mysql4_Abstract->getTable('store_group')
#3 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Mysql4/Collection/Abstract.php(83): Mage_Core_Model_Mysql4_Abstract->getMainTable()
#4 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Mysql4/Collection/Abstract.php(69): Mage_Core_Model_Mysql4_Collection_Abstract->_initSelect()
#5 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Config.php(790): Mage_Core_Model_Mysql4_Collection_Abstract->__construct(Object(Mage_Core_Model_Mysql4_Store_Group))
#6 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Config.php(832): Mage_Core_Model_Config->getModelInstance('core_mysql4/sto...', Object(Mage_Core_Model_Mysql4_Store_Group))
#7 /home/gmautoco/public_html/app/Mage.php(345): Mage_Core_Model_Config->getResourceModelInstance('core/store_grou...', Object(Mage_Core_Model_Mysql4_Store_Group))
#8 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Abstract.php(200): Mage::getResourceModel('core/store_grou...', Object(Mage_Core_Model_Mysql4_Store_Group))
#9 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/Abstract.php(205): Mage_Core_Model_Abstract->getResourceCollection()
#10 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/App.php(373): Mage_Core_Model_Abstract->getCollection()
#11 /home/gmautoco/public_html/app/code/core/Mage/Core/Model/App.php(244): Mage_Core_Model_App->_initStores()
#12 /home/gmautoco/public_html/app/Mage.php(427): Mage_Core_Model_App->init('', 'store', Array)
#13 /home/gmautoco/public_html/app/Mage.php(446): Mage::app('', 'store', Array)
#14 /home/gmautoco/public_html/index.php(82): Mage::run('', 'store')
#15 {main}