I was having the same problem, but since I'm mexican (in a mexican service provider), no one posted the information so I went to the page listed in the error at the opera mini and it helped me.
Go here so you can find the information needed no matter where in the world/Service provider you are in:
www operamini com/helpconnect
(use . instead of the spaces in the link)
:/ the link is wrong, this is the correct one: http://www.operamini.com/help/connect/