Unable to authenticate with the redis server.

#0 /home/osvetim/www/lib/Cm/Cache/Backend/Redis.php(110): Zend_Cache::throwException('Unable to authe...')
#1 /home/osvetim/www/lib/Zend/Cache.php(153): Cm_Cache_Backend_Redis->__construct(Array)
#2 /home/osvetim/www/lib/Zend/Cache.php(94): Zend_Cache::_makeBackend('Mage_Cache_Back...', Array, true, true)
#3 /home/osvetim/www/app/code/core/Mage/Core/Model/Cache.php(137): Zend_Cache::factory('Varien_Cache_Co...', 'Mage_Cache_Back...', Array, Array, true, true, true)
#4 /home/osvetim/www/app/code/community/Lesti/Fpc/Model/Fpc.php(60): Mage_Core_Model_Cache->__construct(Array)
#5 /home/osvetim/www/app/code/core/Mage/Core/Model/Config.php(1354): Lesti_Fpc_Model_Fpc->__construct(Array)
#6 /home/osvetim/www/app/Mage.php(463): Mage_Core_Model_Config->getModelInstance('fpc/fpc', Array)
#7 /home/osvetim/www/app/Mage.php(477): Mage::getModel('fpc/fpc', Array)
#8 /home/osvetim/www/app/code/community/Lesti/Fpc/Model/Observer/Save.php(135): Mage::getSingleton('fpc/fpc')
#9 /home/osvetim/www/app/code/community/Lesti/Fpc/Model/Observer/Save.php(80): Lesti_Fpc_Model_Observer_Save->_getFpc()
#10 /home/osvetim/www/app/code/core/Mage/Core/Model/App.php(1339): Lesti_Fpc_Model_Observer_Save->modelSaveAfter(Object(Varien_Event_Observer))
#11 /home/osvetim/www/app/code/core/Mage/Core/Model/App.php(1318): Mage_Core_Model_App->_callObserverMethod(Object(Lesti_Fpc_Model_Observer_Save), 'modelSaveAfter', Object(Varien_Event_Observer))
#12 /home/osvetim/www/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('model_save_afte...', Array)
#13 /home/osvetim/www/app/code/core/Mage/Core/Model/Abstract.php(465): Mage::dispatchEvent('model_save_afte...', Array)
#14 /home/osvetim/www/app/code/core/Mage/Core/Model/Abstract.php(319): Mage_Core_Model_Abstract->_afterSave()
#15 /home/osvetim/www/app/code/core/Mage/Log/Model/Visitor.php(168): Mage_Core_Model_Abstract->save()
#16 /home/osvetim/www/app/code/core/Mage/Core/Model/App.php(1339): Mage_Log_Model_Visitor->initByRequest(Object(Varien_Event_Observer))
#17 /home/osvetim/www/app/code/core/Mage/Core/Model/App.php(1318): Mage_Core_Model_App->_callObserverMethod(Object(Mage_Log_Model_Visitor), 'initByRequest', Object(Varien_Event_Observer))
#18 /home/osvetim/www/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#19 /home/osvetim/www/app/code/core/Mage/Core/Controller/Varien/Action.php(527): Mage::dispatchEvent('controller_acti...', Array)
#20 /home/osvetim/www/app/code/core/Mage/Core/Controller/Front/Action.php(64): Mage_Core_Controller_Varien_Action->preDispatch()
#21 /home/osvetim/www/app/code/core/Mage/Core/Controller/Varien/Action.php(407): Mage_Core_Controller_Front_Action->preDispatch()
#22 /home/osvetim/www/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#23 /home/osvetim/www/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#24 /home/osvetim/www/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#25 /home/osvetim/www/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#26 /home/osvetim/www/index.php(100): Mage::run('lumi', 'store')
#27 {main}