Google sitemap send show me 404 error

Question

I submitted the sitemap to google sitemap. When I check Sent and Indexed, it shows a big difference.

then I have error checking in one file. it is as follows.

General HTTP error: 404 not found HTTP Error: 404 

I checked the error rule for 404. It shows me when the file does not exist, then this error will occur. but when I click on the file link, it downloads the file. means the file exists.

I tried to resubmit the file and check it after another day, but still It shows the same error.

Answer 1

I rewrote the sitemap and fixed the bug.