YouTube Video Embed on Wordpress forcing Subtitles, Please check my code for error Options

[karlip]

I am trying to embed some YouTube videos on my website and want to force showing the subtitles. I read about how to do it and now it works but the editor says that there is a mistake "Named entity expected. Got none." It works without mistakes on the website but maybe someone knows how to correct it.

If I place the cc_load_policy=1 right behind the URL as described in most blogs then it does not do what I want which is not showing alternative videos once the video ends or is paused.

thanks for your help!

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<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/4cmhow4aPv8?rel=0&cc_load_policy=1" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>

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