dbModel read resource does not implement Zend_Db_Adapter_Abstract

#0 /var/www/clients/client1/web3/web/includes/src/__default.php(27888): Varien_Data_Collection_Db->setConnection(false)
#1 /var/www/clients/client1/web3/web/includes/src/__default.php(20506): Mage_Core_Model_Mysql4_Collection_Abstract->__construct(Object(Mage_Core_Model_Mysql4_Website))
#2 /var/www/clients/client1/web3/web/includes/src/__default.php(20539): Mage_Core_Model_Config->getModelInstance('core_mysql4/web...', Object(Mage_Core_Model_Mysql4_Website))
#3 /var/www/clients/client1/web3/web/app/Mage.php(460): Mage_Core_Model_Config->getResourceModelInstance('core/website_co...', Object(Mage_Core_Model_Mysql4_Website))
#4 /var/www/clients/client1/web3/web/includes/src/__default.php(5248): Mage::getResourceModel('core/website_co...', Object(Mage_Core_Model_Mysql4_Website))
#5 /var/www/clients/client1/web3/web/includes/src/__default.php(5253): Mage_Core_Model_Abstract->getResourceCollection()
#6 /var/www/clients/client1/web3/web/app/code/core/Mage/Core/Model/App.php(571): Mage_Core_Model_Abstract->getCollection()
#7 /var/www/clients/client1/web3/web/app/code/core/Mage/Core/Model/App.php(429): Mage_Core_Model_App->_initStores()
#8 /var/www/clients/client1/web3/web/app/code/core/Mage/Core/Model/App.php(335): Mage_Core_Model_App->_initCurrentStore('bts', 'website')
#9 /var/www/clients/client1/web3/web/app/Mage.php(627): Mage_Core_Model_App->run(Array)
#10 /var/www/clients/client1/web16/web/index.php(70): Mage::run('bts', 'website', Array)
#11 {main}