read error on connection

#0 /www/sites/www.discounttwo-wayradio.com/files/html/lib/Credis/Client.php(599): Credis_Client->__call('select', Array)
#1 /www/sites/www.discounttwo-wayradio.com/files/html/lib/Cm/Cache/Backend/Redis.php(135): Credis_Client->select(0)
#2 /www/sites/www.discounttwo-wayradio.com/files/html/lib/Zend/Cache.php(153): Cm_Cache_Backend_Redis->__construct(Array)
#3 /www/sites/www.discounttwo-wayradio.com/files/html/lib/Zend/Cache.php(94): Zend_Cache::_makeBackend('Cm_Cache_Backen...', Array, true, true)
#4 /www/sites/www.discounttwo-wayradio.com/files/html/app/code/core/Mage/Core/Model/Cache.php(136): Zend_Cache::factory('Varien_Cache_Co...', 'Cm_Cache_Backen...', Array, Array, true, true, true)
#5 /www/sites/www.discounttwo-wayradio.com/files/html/app/code/core/Mage/Core/Model/Config.php(1357): Mage_Core_Model_Cache->__construct(Array)
#6 /www/sites/www.discounttwo-wayradio.com/files/html/app/Mage.php(466): Mage_Core_Model_Config->getModelInstance('core/cache', Array)
#7 /www/sites/www.discounttwo-wayradio.com/files/html/app/code/core/Mage/Core/Model/App.php(412): Mage::getModel('core/cache', Array)
#8 /www/sites/www.discounttwo-wayradio.com/files/html/app/code/core/Mage/Core/Model/App.php(306): Mage_Core_Model_App->_initCache(Array)
#9 /www/sites/www.discounttwo-wayradio.com/files/html/app/code/core/Mage/Core/Model/App.php(348): Mage_Core_Model_App->baseInit(Array)
#10 /www/sites/www.discounttwo-wayradio.com/files/html/app/Mage.php(686): Mage_Core_Model_App->run(Array)
#11 /www/sites/www.discounttwo-wayradio.com/files/html/index.php(84): Mage::run('', 'store')
#12 {main}