What do I do if my google voice app on my iphone 4s isn't letting me in?

I've entered my correct username and password at least 10 times on my phone but it won't let me log in and it shows this message that says: "An error has occurred" and won't let me in. I've done the whole help center thing as well with the option that says something about logging in through a device or a non browser thing and I've even deleted the app and re-downloaded it but it still shows the same message. What do I do?

It's temporary down for the iPhone app. Don't worry.