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Googlebot couldn't access this page because the server didn't understand the syntax of Googlebot's request.
Googlebot couldn't crawl this URL because it points to a non-existent page. Generally, 404s don't harm your site's performance in search, but you can use them to help improve the user experience.
Correct Link: www.example.com/%27hello-world%27
Incorrect Link: www.example.com/?hello-world?