I'm having the same problem. I successfully installed the latest, v. 2.7, version of Limewire on my OS 9 Mac. When I try to open the application, I get the message:

"Unable to locate the application's 'main' class. The class 'com.limegroup.gnutella.gui.Main' must be public and have a 'public static void main(String[])' method. (LAX)."

What can I do? The window says this is a fatal application error.