How Can I Solve Index Coverage Issues?

In my webmaster, I got a message that there have some index coverage issues which need to fix. I visited that page and found out some issues that I am confused. I solved one index coverage issue but others I didn't get a complete idea. I have added an image of that issue.

Can Anybody help me to fix it?

Remove pages from sitemap which are marked noindex and remove pages which don't exist anymore. Sometimes you can find in your sitemap old attachment pages, styles pages etc. which gives index coverage errors.