This page is a duplicate of another page, although it doesn't indicate a preferred canonical page. Google has chosen the other page as the canonical for this page, and so will not serve this page in Search. You can Inspect this URL to see which URL Google considers canonical for this page. This is not an error, but is working as intended, because Google does not serve duplicate pages. However, if you think that Google has chosen the wrong URL as canonical, you can explicitly mark the canonical for this page. Alternately, if you think that this page is not a duplicate of the Google-chosen canonical, you should ensure that the content differs substantially between the two pages. This message indicates that Google has identified the current page as a duplicate of another page on the internet. When Google detects duplicate content, it selects one page as the preferred or "canonical" version to display in its search results. The page you are currently viewing has been determin...