Fatal error: Uncaught TypeError: Argument 1 passed to UKMNorge\DesignWordpress\Environment\Posts::getByCategory() must be of the type integer, null given, called in /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/Controller/Festivalen/etter-festivalen.php on line 13 and defined in /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/Environment/Posts.php:44 Stack trace: #0 /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/Controller/Festivalen/etter-festivalen.php(13): UKMNorge\DesignWordpress\Environment\Posts::getByCategory(NULL) #1 /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/vendor/ukmnorge/designvanilla/TemplateEngine/TemplateEngine.php(167): require('/home/ukmno/pub...') #2 /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/Controller/Festivalen/front-page.php(9): UKMNorge\TemplateEngine\TemplateEngine::requireController('Festivalen', 'etter-festivale...') #3 /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/vendor/ukmnorge/designvanilla/TemplateEn in /home/ukmno/public_html/wp-content/themes/UKMDesignWordpress/Environment/Posts.php on line 44