What triggers this issue?
This issue reports image files that return one of the 4xx or 5xx status codes.
Why is it important?
Broken images won't be displayed on your pages. This will negatively affect the user experience, while search engines won't be able to index these images.
How to fix it?
Such images could have been deleted, moved or renamed. Also, the external website hosting the image can be unavailable.
Replace, fix or remove links to the broken images on your pages.
To get the list of pages that reference the broken internal or external image, click on the number in "No. of IMG inlinks" column in this report.
Where practically possible, keep images within your website's storage space (media gallery) rather than embedding images from other websites.