feriousss on "[Plugin: Query posts by category... and display posts on page in grid layout without coding - Content Views] Warning in Google Webmaster Tools"

After installing this plugin I get this warning message in Google Webmaster Tools:

When we tested a sample of the URLs from your Sitemap, we found that some URLs were not accessible to Googlebot due to an HTTP status error. All accessible URLs will still be submitted.

Sitemap: ieltsly.com/pt_view-sitemap.xml
HTTP Error: 404
URL: /pt_view/grid-id-8c782c1b96/

Does anybody know how to fix this?

https://wordpress.org/plugins/content-views-query-and-display-post-page/