Sitemap can be read, but has errors - Missing XML tag

[reva.yevgen]

Hello.
After I submitted a video sitemap to wembaster tools I've got message:
======
This required tag is missing. Please add it and resubmit.
Examples
Line 13
Parent tag: urlset
Tag: url
=======
Please help.

[XML-Sitemaps Support]

Hello,

what is your video sitemap URL?

[reva.yevgen]

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[XML-Sitemaps Support]

Hello,

the sitemap is empty (no videos indexed) from what I see, hence the error message.

[XML-Sitemaps Support]

Note that only videos from this sources can be detected by sitemap generator bot:
https://www.xml-sitemaps.com/video-sitemap.html
YouTube, Google Video, Vimeo, Dailymotion, MTV

(since they provide API that allow to get video details like play duration/thumbnail etc)
 

[reva.yevgen]

Could you please answer me why I've got this error?
====================
General HTTP error
1 instance
We encountered an error while trying to access your Sitemap. Please ensure your Sitemap follows our guidelines and can be accessed at the location you provided and then resubmit.
Examples
HTTP Error:
404
==================
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[XML-Sitemaps Support]

Hello,

can you send a full screenshot of the page with the error message?