When I try to start LimeWire (FedoraCore-3):

[gizmo@localhost ~]$ limewire
Starting LimeWire...
Java exec found in PATH. Verifying...
Suitable java version found [java = 1.4.2]
Configuring environment...
Loading LimeWire:
Warning: -jar not understood. Ignoring.
Exception in thread "main" java.lang.NoClassDefFoundError: LimeWire.jar
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)
at __gcj_personality_v0 (/usr/lib/LimeWire/java.home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre)
at __libc_start_main (/lib/tls/libc-2.3.3.so)
at _Jv_RegisterClasses (/usr/lib/LimeWire/java.home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre)

************************************************** ****************
Something went wrong with LimeWire.
Maybe you're using the wrong version of Java?
(LimeWire is tested against and works best with with Sun's JRE, Java 1.4+)
The version of Java in your PATH is:
java version "1.4.2"
jdkgcj 0.3.1 (http://www.arklinux.org/projects/jdkgcj)
gcj (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)
Copyright (C) 2004 Free Software Foundation, Inc.
Dies ist freie Software; die Kopierbedingungen stehen in den Quellen. Es
gibt KEINE Garantie; auch nicht für VERKAUFBARKEIT oder FÜR SPEZIELLE ZWECKE.

So I am using java 1.4.2...
but it don't run... i've already asked a friend, but he cannot tell me why LimeWire won't start.
CAN YOU HELP? -thanks in advance!