how to fix You have ad crawler errors, which can result in lost revenue

how to fix You have ad crawler errors, which can result in lost revenue
Our crawler was unable to access the pages listed in the ’Blocked URLs’ column to determine the content and display ads. Click the ’plus’ icon beside each domain to see an expanded list of affected URLs. When our crawler can’t access your content we won’t show ads, resulting in lower revenue and coverage. Follow the link in the ’Error’ column to learn how to correct these errors.
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