dbModel read resource does not implement Zend_Db_Adapter_Abstract

#0 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/Resource/Db/Collection/Abstract.php(134): Varien_Data_Collection_Db->setConnection(false)
#1 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/Config.php(1354): Mage_Core_Model_Resource_Db_Collection_Abstract->__construct(Object(Mage_Core_Model_Resource_Website))
#2 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/Config.php(1386): Mage_Core_Model_Config->getModelInstance('core_resource/w...', Object(Mage_Core_Model_Resource_Website))
#3 /var/www/vhosts/sparitual.com/httpdocs/app/Mage.php(491): Mage_Core_Model_Config->getResourceModelInstance('core/website_co...', Object(Mage_Core_Model_Resource_Website))
#4 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/Abstract.php(208): Mage::getResourceModel('core/website_co...', Object(Mage_Core_Model_Resource_Website))
#5 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/Abstract.php(213): Mage_Core_Model_Abstract->getResourceCollection()
#6 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/App.php(619): Mage_Core_Model_Abstract->getCollection()
#7 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/App.php(477): Mage_Core_Model_App->_initStores()
#8 /var/www/vhosts/sparitual.com/httpdocs/app/code/core/Mage/Core/Model/App.php(360): Mage_Core_Model_App->_initCurrentStore('', 'store')
#9 /var/www/vhosts/sparitual.com/httpdocs/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#10 /var/www/vhosts/sparitual.com/httpdocs/index.php(83): Mage::run('', 'store')
#11 {main}