@YouTube @TeamYouTube unable to add videos to watch later. Get message saying 'Internal Error Encountered' 
We'd like to know more. What device are you using? Just to confirm, have you tried any troubleshooting steps? Keep us posted.
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It's working now, thank you for your response though. I have no idea why it happened. But I'm glad I could report it
Thanks. Twitter will use this to make your timeline better. UndoUndo
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