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Hello @elenis1517
Thank you for your interest in Filter Everything plugin.
It is not error, it is expected behaviour as the Free version works only on native WordPress archive pages (category archive, tag archive, author archive, date, taxonomy etc).
Singular pages in WordPress were created to display single post only and only with Elementor you can display there posts/products loop. So for such cases there is PRO version that allows you to filter on any pages.
It is known error in Elementor, when you can not find any WordPress widget through the Elementor search field. Please, just scroll down to the WordPress section and select there “Filter Everything – Filters” widget.
Thank you. Regards.