Getting 404 is a fairly common issue for custom post types regarding their single post. But this can be easily solved by a simple technique. Please check the following steps-
Go to WordPress admin panel Settings/Permalinks.
Scroll the settings page and click the Save button.
Finally, Go to any single knowledge base post, and refresh the page. Now, the issue of 404 has been solved, and now everything is fine.
Plugin Demo:
https://projects.bluewindlab.net/wppl...
Plugin Download:
https://1.envato.market/bkbm-wp
Documentation:
https://projects.bluewindlab.net/wppl...