The time watched profile lets you see your daily average watch time and how long you’ve watched YouTube videos today, yesterday and over the past 7 days. More info here: https://goo.gl/Z5oFpc . Also, what device are you getting this error on? Keep us posted.
That's odd! Try clearing your browser's cache cookies. Also, uninstall and reinstall the app to see if this makes difference. Note: If you have any offline content saved on YouTube app, it'll be deleted once you uninstall the app.