What should I do if my tablet has message pop-up "Unfortunately, Google+ has stopped"

[AC Question]

What should I do if I am constantly interrupted on my Barnes and Noble Nook tablet with pop-up messages that constantly says things like "Unfortunately, Google+ has stopped."

 

[B. Diddy]

Welcome to Android Central! Is it only Google+ that keeps crashing, or is it other apps as well?

Which Nook is this? Is it one of the Galaxy Tabs, or one of the original Nooks?