Trouble with CPT Child 404

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You can’t have both a page and a Custom Post type with the same slug, in your case videos. See: https://core.trac.wordpress.org/ticket/38599 for a ticket recommending this be changed in core. A few solutions:

  • Change either the page or the post type to video instead of video

  • Follow the Template Hierarchy and create a archive-videos.php with the contents of your Video page.

  • Define a unique rewrite slug in the parameters for more details, as it does not support child pages.