This happens when the page or domain BC Data China itself no longer exists. situation. A deleted link, on the other hand, is different because the page still exists, but it no longer links to you. content refresh or simply because the person in charge of the website decided not to link to you anymore.
A crawl error occurs when a search engine, such as Google, tries to access a web page but fails. If the page appears after a new crawl, the problem is solved. However, if it does not, the page may be missing. 301 redirects are a very common operation when migrating a website.