What triggers this issue?
This issue reports indexable pages on your website that only have nofollowed incoming internal links.
Note: An indexable page is an HTML page returning the 200 HTTP status code that has neither the "rel=canonical" tag pointing to a different URL nor the "noindex" directive.
Why is it important?
Unless such page is added to the website's sitemap file, search engines won't be able to access (and thus index) it via nofollowed links on the website.
How to fix it?
If you expect a page to rank in search engines, it should get a good amount of relevant followed links from other pages of the website. Where possible, change the links to this page from nofollowed to followed.
Make sure that the linking page does not have the "nofollow" directive for robots.
To get the list of pages that link to the reported URL, click on the number in the "No. of inlinks nofollow" column.
Here's what you'll get