Hi Karen
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
What is the make and model of the TV?
It is recomended when you get this error, you should factory reset the TV:
https://support.google.com/youtube/forum/AAAAiu...
The procedure to do so might vary depending on the make and model of your TV.