Can't hook filter to my plugin

OJS 3.4.0.5
filterConfig.xml is set, there is a group in filter_groups, but my filter is missing in filters.
So, when i call getObjectByGroup, result is empty array. So, i get this error
Uncaught Error: Call to a member function SetExportSettings() on null in C:\ojs-3.4.0-5\plugins\importexport\rsciexport\RSCIExportPlugin.php:141
Stack trace:
#0 C:\Users\bleidd\Desktop\ojs-3.4.0-5\plugins\importexport\rsciexport\RSCIExportPlugin.php(65): APP\plugins\importexport\rsciexport\RSCIExportPlugin->exportIssue(‘1’, Object(APP\journal\Journal))
#1 C:\Users\bleidd\Desktop\ojs-3.4.0-5\lib\pkp\pages\management\PKPToolsHandler.php(104): APP\plugins\importexport\rsciexport\RSCIExportPlugin->display(Array, Object(APP\core\Request))
#2 [internal function]: PKP\pages\management\PKPToolsHandler->importexport(Array, Object(APP\core\Request))
#3 C:\Users\bleidd\Desktop\ojs-3.4.0-5\lib\pkp\classes\core\PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request))
#4 C:\Users\bleidd\Desktop\ojs-3.4.0-5\lib\pkp\classes\core\PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array, false)
#5 C:\Users\bleidd\Desktop\ojs-3.4.0-5\lib\pkp\classes\core\Dispatcher.php(165): PKP\core\PKPPageRouter->route(Object(APP\core\Request))
#6 C:\Users\bleidd\Desktop\ojs-3.4.0-5\lib\pkp\classes\core\PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request))
#7 C:\Users\bleidd\Desktop\ojs-3.4.0-5\index.php(21): PKP\core\PKPApplication->execute()
#8 {main}
thrown in C:\Users\bleidd\Desktop\ojs-3.4.0-5\plugins\importexport\rsciexport\RSCIExportPlugin.php on line 141
Code:

$filterDao = DAORegistry::getDAO('FilterDAO');
$rsciExportFilters = $filterDao->getObjectsByGroup('issue=>rsci-xml');
        
//assert(count($rsciExportFilters) == 1); // Assert only a single serialization filter
$exportFilter = array_shift($rsciExportFilters);
$context = Application::get()->getRequest()->getContext();
$exportSettings = array ('isExportArtTypeFromSectionAbbrev' => $this->getSetting($context->getId(), 'exportArtTypeFromSectionAbbrev'),
                            'isExportSections' => $this->getSetting($context->getId(), 'exportSections'),
                            'journalRSCITitleId' => $this->getSetting($context->getId(), 'journalRSCITitleId'));
$exportFilter->SetExportSettings($exportSettings);

Should i add my filter somewhere?
Thank you in advance

created row in filters table.
error disappeared.
Is this the solution?