Youtube won't let me sign in on iPhone

I still have the default app and never updated my software. Youtube used to let me sign in all the time! Now it just says, "Authorization Error: Invalid username and/or Password" I've tried signing in with my old username, new username, and my google account username/email too and it still won't let me sign in! Please help! I'd die without my playlists ;; A ;;

Added (1). The default app is in the one that still looks like a little TV that you can't delete ;-;

Because iPhones suck

I have an iPhone and I had no problems.

My iphone 3 is doing the exact same thing! I've been trying to find answers all night. You are not alone

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