我正在测试公司网站，每次从w3af运行任何类型的测试时
w3af identified the user-configured URLs listed below as non-existing pages (404). This could result in a scan with low test coverage: some application areas might not be scanned.
Please manually verify that these URLs exist and, consider running a new scan with different targets.
这是什么意思，我该如何绕过？