Can't add URL to library

[Catts]

I have recently been having an issue where I am unable to add any URL media to Mezzmo. This has only been happening recently as I have watched several dozen youtube videos via Mezzmo just fine. It comes up with an error dialogue: " The URL is not a supported video, audio, image, or rss feed playlist resource. Mime type: text/html; charset=utf-8". This started today and has happened to every URL I have tried to add to Mezzmo. Even attempting to play previously functioning videos causes this same error. Other media streaming works just fine while this occurs.

I am unable to find anyone else with the same problem so hopefully there is an answer here.

E: image of the error