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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(523): 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('<adminhtml><tra...', 'SM_605ED57F3311...', Array, NULL)
#4 D:\website\groupon\includes\src\Varien_Cache_Core.php(145): Zend_Cache_Core->save('<adminhtml><tra...', '605ED57F3311620...', Array, NULL, 8)
#5 D:\website\groupon\includes\src\Mage_Core_Model_Cache.php(403): Varien_Cache_Core->save('<adminhtml><tra...', '605ED57F3311620...', Array, NULL)
#6 D:\website\groupon\includes\src\__default.php(21477): Mage_Core_Model_Cache->save('<adminhtml><tra...', '605ed57f3311620...', Array, NULL)
#7 D:\website\groupon\includes\src\__default.php(23268): Mage_Core_Model_App->saveCache('<adminhtml><tra...', 'config_global_a...', Array, NULL)
#8 D:\website\groupon\includes\src\__default.php(23190): Mage_Core_Model_Config->_saveCache('<adminhtml><tra...', 'config_global_a...', Array, NULL)
#9 D:\website\groupon\includes\src\__default.php(20723): Mage_Core_Model_Config->saveCache()
#10 D:\website\groupon\includes\src\__default.php(20645): Mage_Core_Model_App->_initModules()
#11 D:\website\groupon\app\Mage.php(685): Mage_Core_Model_App->run(Array)
#12 D:\website\groupon\index.php(408): Mage::run('', 'store')
#13 {main}