There was a problem connecting to server “AFP@strumpet”.

During Installation of Mac OS X 10.7 Lion, I find one very serious problem. I am unable to connect to my Gentoo Netatalk AFP server and when I try to get the connection, I find the following error. Is this a very serious issue?
Can any one tell me its proper solution and if possible provide snapshots.
There was a problem connecting to the server “AFP@strumpet”.
The version of the server you are trying to connect to is not supported. Please contact your system administrator to resolve the problem.
