Can't get filling percentage

#0 /home/sites_web/client/www2.loewe.com/www/lib/Zend/Cache/Backend/Memcached.php(403): Zend_Cache::throwException('Can't get filli...')
#1 /home/sites_web/client/www2.loewe.com/www/lib/Zend/Cache/Backend/TwoLevels.php(518): Zend_Cache_Backend_Memcached->getFillingPercentage()
#2 /home/sites_web/client/www2.loewe.com/www/lib/Zend/Cache/Backend/TwoLevels.php(192): Zend_Cache_Backend_TwoLevels->_getFastFillingPercentage('saving')
#3 /home/sites_web/client/www2.loewe.com/www/lib/Zend/Cache/Core.php(390): Zend_Cache_Backend_TwoLevels->save('a:8:{s:10:"bloc...', '73a_CORE_CACHE_...', Array, NULL)
#4 /home/sites_web/client/www2.loewe.com/www/lib/Varien/Cache/Core.php(145): Zend_Cache_Core->save('a:8:{s:10:"bloc...', 'CORE_CACHE_OPTI...', Array, NULL, 8)
#5 /home/sites_web/client/www2.loewe.com/www/app/code/core/Mage/Core/Model/Cache.php(403): Varien_Cache_Core->save('a:8:{s:10:"bloc...', 'CORE_CACHE_OPTI...', Array, NULL)
#6 /home/sites_web/client/www2.loewe.com/www/app/code/core/Mage/Core/Model/Cache.php(481): Mage_Core_Model_Cache->save('a:8:{s:10:"bloc...', 'core_cache_opti...')
#7 /home/sites_web/client/www2.loewe.com/www/app/code/core/Mage/Core/Model/Cache.php(520): Mage_Core_Model_Cache->_initOptions()
#8 /home/sites_web/client/www2.loewe.com/www/app/code/local/Mage/Core/Model/App.php(1262): Mage_Core_Model_Cache->canUse('config')
#9 /home/sites_web/client/www2.loewe.com/www/app/code/core/Mage/Core/Model/Config.php(414): Mage_Core_Model_App->useCache('config')
#10 /home/sites_web/client/www2.loewe.com/www/app/code/core/Mage/Core/Model/Config.php(294): Mage_Core_Model_Config->_canUseCacheForInit()
#11 /home/sites_web/client/www2.loewe.com/www/app/code/local/Mage/Core/Model/App.php(413): Mage_Core_Model_Config->loadModulesCache()
#12 /home/sites_web/client/www2.loewe.com/www/app/code/local/Mage/Core/Model/App.php(343): Mage_Core_Model_App->_initModules()
#13 /home/sites_web/client/www2.loewe.com/www/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#14 /home/sites_web/client/www2.loewe.com/www/index.php(88): Mage::run('', 'store')
#15 {main}