SELECT failed: DB Error: syntax error

SELECT news.id, news.id_category, category.title AS categoryTitle, category.short_url AS categoryUrl, parentcategory.title AS parentcategoryTitle, parentcategory.short_url AS parentcategoryUrl, news.headline, news.subline, news.short_text, news.long_text, news.pdf, news.pdf_title, news.slideshow, news.catalog, news.link, news.link_title, news.short_url, news.keywords, news.date_start, news.date_end, news.img_available, position.position FROM cms_de_news_selection AS selection INNER JOIN cms_de_news AS news ON selection.id_news = news.id INNER JOIN cms_de_news_position AS position ON selection.id_news = position.id_news INNER JOIN cms_de_news_categories AS category ON selection.id_category = category.id INNER JOIN cms_de_news_categories AS parentcategory ON category.id_parent = parentcategory.id WHERE news.status = 'online' AND selection.id_category IN () AND position.id_category IN () AND category.hidden = 0 AND selection.status = 'active' GROUP BY news.id ORDER BY category.position, position.position ASC LIMIT 50