The PDO extension is required for this adapter but the extension is not loaded

#0 /home/storehouse1/public_html/lib/Zend/Db/Adapter/Abstract.php(248): Zend_Db_Adapter_Pdo_Abstract->setFetchMode(2)
#1 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Resource.php(165): Zend_Db_Adapter_Abstract->__construct(Array)
#2 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Resource.php(110): Mage_Core_Model_Resource->_newConnection('pdo_mysql', Object(Mage_Core_Model_Config_Element))
#3 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(320): Mage_Core_Model_Resource->getConnection('core_write')
#4 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(350): Mage_Core_Model_Resource_Db_Abstract->_getConnection('write')
#5 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(335): Mage_Core_Model_Resource_Db_Abstract->_getWriteAdapter()
#6 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Resource/Cache.php(53): Mage_Core_Model_Resource_Db_Abstract->_getReadAdapter()
#7 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Cache.php(478): Mage_Core_Model_Resource_Cache->getAllOptions()
#8 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Cache.php(520): Mage_Core_Model_Cache->_initOptions()
#9 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/App.php(1183): Mage_Core_Model_Cache->canUse('config')
#10 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Config.php(414): Mage_Core_Model_App->useCache('config')
#11 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/Config.php(294): Mage_Core_Model_Config->_canUseCacheForInit()
#12 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/App.php(413): Mage_Core_Model_Config->loadModulesCache()
#13 /home/storehouse1/public_html/app/code/core/Mage/Core/Model/App.php(343): Mage_Core_Model_App->_initModules()
#14 /home/storehouse1/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#15 /home/storehouse1/public_html/index.php(98): Mage::run('', 'store')
#16 {main}