Mointor Modul backend was not configured

Hello Guys,
I have activated the cinga monitoring module and got an error that the backend was not configured, but I can’t find a config file where I could set something.

#0 /usr/share/icingaweb2/modules/monitoring/library/Monitoring/Backend/MonitoringBackend.php(77): Icinga\Module\Monitoring\Backend\MonitoringBackend::loadConfig()
#1 /usr/share/icingaweb2/modules/monitoring/library/Monitoring/Controller.php(32): Icinga\Module\Monitoring\Backend\MonitoringBackend::instance()
#2 /usr/share/php/Icinga/Web/Controller/ModuleActionController.php(28): Icinga\Module\Monitoring\Controller->moduleInit()
#3 /usr/share/php/Icinga/Web/Controller/ActionController.php(180): Icinga\Web\Controller\ModuleActionController->prepareInit()
#4 /usr/share/php/Icinga/Web/Controller/Dispatcher.php(59): Icinga\Web\Controller\ActionController->__construct()
#5 /usr/share/icinga-php/vendor/vendor/shardj/zf1-future/library/Zend/Controller/Front.php(954): Icinga\Web\Controller\Dispatcher->dispatch()
#6 /usr/share/php/Icinga/Application/Web.php(294): Zend_Controller_Front->dispatch()
#7 /usr/share/php/Icinga/Application/webrouter.php(105): Icinga\Application\Web->dispatch()
#8 /usr/share/icingaweb2/public/index.php(4): require_once(String)
#9 {main}

the monitoring module is for the old deprecated ido (icinga-data-output).
if you use icingadb there is no need to enable the monitoring module anymore