Help Can't log into Market

[GNS1310]

I click the Market and a screen pops up that says:

Google Sign In
You entered the wrong password or your account has changed. Please re-enter your password

Username: ******
Password:

My username is @youtube.com...which is thru my Google account.
I tried my password, didn't work. I've tried every other password I have and they don't work. I can sign in on my computer but not my phone.
Any ideas? Thanks.