I can't even open LimeWire cause I get this java error message. What do I need to do? Thanks!

java.lang.ClassNotFoundException: com.limegroup.gnutella.gui.Main
at com.zerog.lax.LAX.launch(Compiled Code)
at com.zerog.lax.LAX.main(Unknown Source)
at com.apple.mrj.JManager.JMStaticMethodDispatcher.ru n(JMAWTContextImpl.java)
at java.lang.Thread.run(Thread.java)