Why HaMachi error list generic is displaying as I connect to Server?

Hi,
Hamachi is a good VPN application to deploy private network. I used it almost 3 months ago but now I am facing problem. As I try to connect with server, Hamachi error list generic is displayed which warns Hamachi server has rejected your login request. I have reinstalled it and also deleted registry values but same problem. I am using window 7. Please guide me how to proceed.
