My YouTube app or anything from google that goes to YouTube to watch is not working,what should I do?

I have a windows phone Lumia 730. I had a YouTube app. For last few days my YouTube app even the ucbrowser I have is not working when it comes to the YouTube site. I always study by those YouTube videos… And now I can't.whenever I am trying to open any YouTube video,it's simply not opening. Please help me… Please

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