read error on connection

#0 /var/www/heathweb/production/releases/build_60/htdocs/lib/Mage/Cache/Backend/Redis.php(210): Credis_Client->__call('hGet', Array)
#1 /var/www/heathweb/production/releases/build_60/htdocs/lib/Mage/Cache/Backend/Redis.php(210): Credis_Client->hGet('zc:k:PLAYGROUND...', 'd')
#2 /var/www/heathweb/production/releases/build_60/htdocs/lib/Zend/Cache/Core.php(303): Mage_Cache_Backend_Redis->load('PLAYGROUND_DEVF...', false)
#3 /var/www/heathweb/production/releases/build_60/htdocs/lib/Varien/Cache/Core.php(158): Zend_Cache_Core->load('FPC_DESIGN_EXCE...', false, false)
#4 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Mage/Core/Model/Cache.php(379): Varien_Cache_Core->load('FPC_DESIGN_EXCE...')
#5 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Enterprise/PageCache/Model/Processor.php(184): Mage_Core_Model_Cache->load('FPC_DESIGN_EXCE...')
#6 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Enterprise/PageCache/Model/Processor.php(145): Enterprise_PageCache_Model_Processor->_getDesignPackage()
#7 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Enterprise/PageCache/Model/Processor.php(107): Enterprise_PageCache_Model_Processor->_createRequestIds()
#8 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Mage/Core/Model/Cache.php(703): Enterprise_PageCache_Model_Processor->__construct()
#9 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Mage/Core/Model/Cache.php(685): Mage_Core_Model_Cache->_getProcessor('Enterprise_Page...')
#10 /var/www/heathweb/production/releases/build_60/htdocs/app/code/core/Mage/Core/Model/App.php(340): Mage_Core_Model_Cache->processRequest()
#11 /var/www/heathweb/production/releases/build_60/htdocs/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#12 /var/www/heathweb/production/releases/build_60/htdocs/index.php(87): Mage::run('', 'store')
#13 {main}