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Can't get filling percentage

Trace:
#0 D:\website\groupon\includes\src\Zend_Cache_Backend_Memcached.php(424): Zend_Cache::throwException('Can't get filli...')
#1 D:\website\groupon\includes\src\Zend_Cache_Backend_TwoLevels.php(518): Zend_Cache_Backend_Memcached->getFillingPercentage()
#2 D:\website\groupon\includes\src\Zend_Cache_Backend_TwoLevels.php(192): Zend_Cache_Backend_TwoLevels->_getFastFillingPercentage('saving')
#3 D:\website\groupon\includes\src\__default.php(62882): Zend_Cache_Backend_TwoLevels->save('<block name="fo...', 'SM_F68C8ADA7617...', Array, NULL)
#4 D:\website\groupon\includes\src\Varien_Cache_Core.php(145): Zend_Cache_Core->save('<block name="fo...', 'F68C8ADA7617BAD...', Array, NULL, 8)
#5 D:\website\groupon\includes\src\Mage_Core_Model_Cache.php(403): Varien_Cache_Core->save('<block name="fo...', 'F68C8ADA7617BAD...', Array, NULL)
#6 D:\website\groupon\includes\src\__default.php(21477): Mage_Core_Model_Cache->save('<block name="fo...', 'f68c8ada7617bad...', Array, NULL)
#7 D:\website\groupon\includes\src\__default.php(28436): Mage_Core_Model_App->saveCache('<block name="fo...', 'LAYOUT_168dfbec...', Array, NULL)
#8 D:\website\groupon\includes\src\__default.php(28465): Mage_Core_Model_Layout_Update->saveCache()
#9 D:\website\groupon\includes\src\__default.php(14035): Mage_Core_Model_Layout_Update->load()
#10 D:\website\groupon\includes\src\__default.php(13988): Mage_Core_Controller_Varien_Action->loadLayoutUpdates()
#11 D:\website\groupon\app\code\local\Lanvo\Keyword\controllers\IndexController.php(106): Mage_Core_Controller_Varien_Action->loadLayout()
#12 D:\website\groupon\includes\src\__default.php(14147): Lanvo_Keyword_IndexController->indexAction()
#13 D:\website\groupon\includes\src\__default.php(18515): Mage_Core_Controller_Varien_Action->dispatch('index')
#14 D:\website\groupon\includes\src\__default.php(18048): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#15 D:\website\groupon\includes\src\__default.php(20656): Mage_Core_Controller_Varien_Front->dispatch()
#16 D:\website\groupon\app\Mage.php(685): Mage_Core_Model_App->run(Array)
#17 D:\website\groupon\index.php(408): Mage::run('', 'store')
#18 {main}