HTML Sitemap error

I’ve submitted the sitemap to Google in their Webmaster tools. However, and despite the test coming back clear, it continues to say pending.

There is 1 warning and 1 error.

The error
Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead.
1
Sitemap: http://www.gadgetreview.com/post-sitemap62.xml
Tag: html

The warning
We’ve detected duplicate video titles.
We’ve detected duplicate video titles in your sitemap or feed. Duplicate titles make it difficult for users to discern the content of the video. Make the titles more specific so they better reflect the content of the video.
Sitemap: http://www.gadgetreview.com/video-sitemap.xml
Value: Weekly Gaming News Fit To Print

https://wordpress.org/plugins/wordpress-seo/