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This error message from Ahrefs indicates that some of the pages listed in your sitemap are not canonical, meaning that they may have duplicate content or similar pages on your website that are considered the primary version by search engines. It's important to ensure that all pages in your sitemap are canonical to avoid confusion for search engines and to improve the indexing and ranking of your website. To fix this error, you should review your sitemap and remove any non-canonical pages or update them to the correct canonical version. You can also use canonical tags on your web pages to indicate the primary version of the content to search engines.