Message "unfortunately, You Tube has stopped'

[AC Question]

When I open my tablet the above message appears and stops me opening any thing on my tablet cannot get into settings all is locked

 

[B. Diddy]

Welcome to Android Central! Which tablet? Does it persist after a reboot, or in Safe Mode?

EDIT: Probably a duplicate post, see discussion here: http://forums.androidcentral.com/as...-quad-core-tablet-4-4-kitkat.html#post5831403. Thread closed to prevent parallel discussions.