#1 Boot the tablet into safe mode. Push the power button for a few seconds until the power off and reset screen appears. Then press the "power off" button for 5 seconds it with then prompt you to restart in safe mode. I still had the same pop up in safe mode, however.
#2 Go to the google play store app and go to the youtube application using the search bar. Once you have it on your screen click on "enable". It should solve your issue.
Be mindful that you will have to be quick about tapping the "ok" button on the popup screen for the error while doing all of this. Have a little patients you are about to fix your issue.
Hope this helps.