Connection to Redis failed after 2 failures.Last Error : (111) Connection refused

#0 /var/www/webroot/ROOT/lib/Credis/Client.php(439): Credis_Client->connect()
#1 /var/www/webroot/ROOT/lib/Credis/Client.php(1017): Credis_Client->connect()
#2 /var/www/webroot/ROOT/lib/Credis/Client.php(824): Credis_Client->write_command('*3\r\n$4\r\nhget\r\n$...')
#3 /var/www/webroot/ROOT/lib/Cm/Cache/Backend/Redis.php(198): Credis_Client->__call('hget', Array)
#4 /var/www/webroot/ROOT/lib/Zend/Cache/Core.php(306): Cm_Cache_Backend_Redis->load('e34_AMSHOPBY__C...', false)
#5 /var/www/webroot/ROOT/lib/Varien/Cache/Core.php(158): Zend_Cache_Core->load('e34_AMSHOPBY__C...', false, false)
#6 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Cache.php(379): Varien_Cache_Core->load('AMSHOPBY_ CATAL...')
#7 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/App.php(1153): Mage_Core_Model_Cache->load('amshopby_ catal...')
#8 /var/www/webroot/ROOT/app/code/core/Mage/Core/Helper/Abstract.php(76): Mage_Core_Model_App->loadCache('amshopby_ catal...')
#9 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Helper/Cached.php(26): Mage_Core_Helper_Abstract->_loadCache('amshopby_ catal...')
#10 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Helper/Attributes.php(98): Amasty_Shopby_Helper_Cached->load('positions_attri...')
#11 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Model/Url/Builder.php(64): Amasty_Shopby_Helper_Attributes->getPositionsAttributes()
#12 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Model/Url/Builder.php(85): Amasty_Shopby_Model_Url_Builder::initialize()
#13 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Model/Catalog/Layer/Filter/Category.php(41): Amasty_Shopby_Model_Url_Builder->reset()
#14 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Config.php(1357): Amasty_Shopby_Model_Catalog_Layer_Filter_Category->__construct(Array)
#15 /var/www/webroot/ROOT/app/Mage.php(463): Mage_Core_Model_Config->getModelInstance('catalog/layer_f...', Array)
#16 /var/www/webroot/ROOT/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(87): Mage::getModel('catalog/layer_f...')
#17 /var/www/webroot/ROOT/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(73): Mage_Catalog_Block_Layer_Filter_Abstract->_initFilter()
#18 /var/www/webroot/ROOT/app/code/core/Mage/Catalog/Block/Layer/View.php(117): Mage_Catalog_Block_Layer_Filter_Abstract->init()
#19 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/Block/Catalog/Layer/View.php(627): Mage_Catalog_Block_Layer_View->_prepareLayout()
#20 /var/www/webroot/ROOT/app/code/core/Mage/Core/Block/Abstract.php(297): Amasty_Shopby_Block_Catalog_Layer_View->_prepareLayout()
#21 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#22 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('amshopby/catalo...', 'amshopby.navlef...')
#23 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('amshopby/catalo...', 'amshopby.navlef...')
#24 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#25 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/Layout.php(210): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#26 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#27 /var/www/webroot/ROOT/app/code/core/Mage/Catalog/controllers/CategoryController.php(148): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#28 /var/www/webroot/ROOT/app/code/local/Amasty/Shopby/controllers/CategoryController.php(49): Mage_Catalog_CategoryController->viewAction()
#29 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Amasty_Shopby_CategoryController->viewAction()
#30 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#31 /var/www/webroot/ROOT/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#32 /var/www/webroot/ROOT/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#33 /var/www/webroot/ROOT/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#34 /var/www/webroot/ROOT/index.php(96): Mage::run('', 'store')
#35 {main}