An exception occured while bootstrapping the application

An exception occured while bootstrapping the application.

No entry is registered for key 'db' on line 0

Stack Trace:

#0 /var/www/clients/client13/web13/web/app/modules/default/models/Tests.php(9): Zend_Registry::get('db')
#1 /var/www/clients/client13/web13/web/lib/Zend/Db/Table/Abstract.php(269): Tests->init()
#2 /var/www/clients/client13/web13/web/lib/Zend/Db/Table.php(77): Zend_Db_Table_Abstract->__construct(Array)
#3 /var/www/clients/client13/web13/web/lib/Ycms/Controller/Action.php(67): Zend_Db_Table->__construct()
#4 /var/www/clients/client13/web13/web/app/modules/default/controllers/PrzedszkoleController.php(21): Ycms_Controller_Action->init()
#5 /var/www/clients/client13/web13/web/lib/Zend/Controller/Action.php(133): PrzedszkoleController->init()
#6 /var/www/clients/client13/web13/web/lib/Zend/Controller/Dispatcher/Standard.php(262): Zend_Controller_Action->__construct(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http), Array)
#7 /var/www/clients/client13/web13/web/lib/Zend/Controller/Front.php(946): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#8 /var/www/clients/client13/web13/web/index.php(29): Zend_Controller_Front->dispatch()
#9 {main}