This is a response from Facebook API and it does not indicate that it is a major problem.

    This error An unknown error has occurred is mostly related to the post content or Image URL issue

    If your post type is “Image” make sure that the image URL dose does not contain any spaces ( or %20 )

    If there is any space or contain %20 then this issue will be shown while sending the posts to Facebook.

    in Facebook Poster Web Version
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