read error on connection

#0 /var/www/hankypanky/releases/1.0.0.4/lib/Cm/Cache/Backend/Redis.php(184): Credis_Client->__call('hGet', Array)
#1 /var/www/hankypanky/releases/1.0.0.4/lib/Cm/Cache/Backend/Redis.php(184): Credis_Client->hGet('zc:k:1e9_FPC_DE...', 'm')
#2 /var/www/hankypanky/releases/1.0.0.4/lib/Zend/Cache/Core.php(329): Cm_Cache_Backend_Redis->test('1e9_FPC_DESIGN_...')
#3 /var/www/hankypanky/releases/1.0.0.4/app/code/core/Enterprise/PageCache/Model/Observer.php(148): Zend_Cache_Core->test('FPC_DESIGN_EXCE...')
#4 /var/www/hankypanky/releases/1.0.0.4/app/code/core/Enterprise/PageCache/Model/Observer.php(98): Enterprise_PageCache_Model_Observer->_saveDesignException()
#5 /var/www/hankypanky/releases/1.0.0.4/app/code/core/Mage/Core/Model/App.php(1338): Enterprise_PageCache_Model_Observer->cacheResponse(Object(Varien_Event_Observer))
#6 /var/www/hankypanky/releases/1.0.0.4/app/code/core/Mage/Core/Model/App.php(1317): Mage_Core_Model_App->_callObserverMethod(Object(Enterprise_PageCache_Model_Observer), 'cacheResponse', Object(Varien_Event_Observer))
#7 /var/www/hankypanky/releases/1.0.0.4/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_fron...', Array)
#8 /var/www/hankypanky/releases/1.0.0.4/app/code/core/Mage/Core/Controller/Varien/Front.php(182): Mage::dispatchEvent('controller_fron...', Array)
#9 /var/www/hankypanky/releases/1.0.0.4/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#10 /var/www/hankypanky/releases/1.0.0.4/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#11 /var/www/hankypanky/releases/1.0.0.4/index.php(98): Mage::run('default', 'store', Array)
#12 {main}