Whenever you add hreflang tags, make certain they all point to indexable and crawlable pages. Look at which tags are causing the problems and rectify them by making sure the pages they’re pointing to are live.  It will also assist you to add the default "x-default" tag for people from https://addons.prestashop.com/pl/seo-pozycjonowanie-naturalne/31857-automatyczne-google-rich-snippets-json-ld-opengraph-seo.html