Why wont the youtube app load?

[AC Question]

My younger brothers Samsung Galaxy Tab 3 has NO google playstore app. Which I don't know the reasons why. But He also has a youtube app that wont load. He is connected to the wifi in the house and the tablet hasn't ever left the house except a few occasions. But suddenly, his youtube app wont load. It continues to say " there was a problem with the network", "retry", and " unfortunately, the process com.google.process.gappss has stopped". Can somebody please tell me what I can do to fix it?

 

[B. Diddy]

Welcome to Android Central! Where did your brother buy that tablet? Some devices may not have Google Play certification. The Tab 3 ought to be certified, but I wonder if certain regional versions might lack it. Another possibility is that the device is a counterfeit/knockoff.