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The robots.txt file tells search engines which of your site's pages they can crawl. An invalid robots.txt configuration can cause two types of problems:

• It can keep search engines from crawling public pages, causing your content to show up less often in search results.
• It can cause search engines to crawl pages you may not want shown in search results.

How the Lighthouse robots.txt audit fails 

So here  how to fix it , simply you have to ceate rebots.txt on public_html  then  use this code and change your website url 

User-agent: Googlebot
Disallow:
User-agent: googlebot-image
Disallow:
User-agent: googlebot-mobile
Disallow:
User-agent: MSNBot
Disallow:
User-agent: Slurp
Disallow:
User-agent: Teoma
Disallow: /
User-agent: Gigabot
Disallow: /
User-agent: Nutch
Disallow: /
User-agent: ia_archiver
Disallow:
User-agent: baiduspider
Disallow: /
User-agent: naverbot
Disallow: /
User-agent: yeti
Disallow: /
User-agent: yahoo-mmcrawler
Disallow:
User-agent: psbot
Disallow: /
User-agent: yahoo-blogs/v3.9
Disallow:
User-agent: *
Disallow:
Crawl-delay: 10
Disallow: /cgi-bin/
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