Superuser gave me this error when I tried to login:

This is an OpenID we haven't seen before:

openid text here

Do you want to create a new Super User account with this OpenID?

(If you want to associate this OpenID with an existing account, click Cancel, log in under your existing account, then click the New Login link on your user page.)

I think this is poorly written because the way to associate my account is to click "New Login" (opposite of what is written) and then choose associate with stackoverflow accounts.