Hello friends,
I would like to know that What is Crawl Error..?
404 error page is not found is know as crawl error
Google crawl your website that time some error can occur like 404 page not found error, or so warnings also can occur, we have to fix these all.
Crawl error is the error that search engines have while crawling your webpage. It may be due to various causes that the search engine spiders are unable to crawl certain webpages. You need to check and verify to remove these errors.
If any pages of your website have been broken or deleted, it will consider as 404 errors. Whenever Google crawl your 404 error pages, it will notify that pages through crawl errors to you.