After starting mule.sh and entering info, then clicking 'login', a window opens and after a split second an error box pops up:
|ExceptionInInitializerError
|null

I'm trying to run Planet Mule for the first time, on a 5 year old laptop (Acer 5500Z) with the Intel 915GM graphics chipset. I tried it both on the openjre and sunjre (java 6) from ubuntu 10.04 and its parnter repository.

Here's the log_init.txt:
  INFO [Properties.<init>]                           VERSION: 1.2.4
  INFO [Properties.<init>]                           Classpath: ./data.jar
  INFO [Properties.<init>]                           Java VM: 16.3-b01
  INFO [Properties.<init>]                           Java Runtime: 1.6.0_20-b02
  INFO [Properties.<init>]                           OS: Linux 2.6.32-24-generic i386
  INFO [Properties.<init>]                           Java Library Path: lib
  INFO [Properties.<init>]                           Max Memory: 259522560
  INFO [Properties.<init>]                           Avaialble Processors: 1
  INFO [PropertiesBase.readFromFile]                 Reading Settings from file settings.txt
  INFO [Settings.<init>]                             Settings file not found: settings.txt (No such file or directory)
  INFO [SubstanceLoader.initLookAndFeel]             Window Skin: Default
  INFO [SlickLogSystem.info]                         Enabling Adam's AI (Not Mac)
  INFO [Main.main]                                   lpSolve: 5.5 Release 0 Build 15
  INFO [SoundPlayer.initialize]                      Initializing Sound System
  INFO [SlickLogSystem.info]                         Initialising sounds..
  INFO [SlickLogSystem.info]                         - Sound works
  INFO [SlickLogSystem.info]                         - 64 OpenAL source available
  INFO [SlickLogSystem.info]                         - Sounds source generated
  INFO [MasterClient.setServerAddress]               MasterClient: Address http://www.planetmule.com/server
  INFO [MasterClient.logSend]                        MasterClient: Sending Login
  INFO [MasterClient.apply]                          MasterClient: Session ID: 745a78a6ad2cd8f9e2a4072e2d524403
  INFO [Login$MasterListener$1.run]                  Logged in as "nanite" (id 17264)
  INFO [MetaFrame.<init>]                            Creating Meta Frame
  INFO [MapSkinParser.findSkins]                     No extra skins found
  INFO [MasterClient.logSend]                        MasterClient: Sending Enter Lobby
  INFO [Login.dispose]                               Disposing login
  INFO [Main.main]                                   Creating game container
  INFO [MuleGameContainer.<init>]                    LWJGL Version: 2.4.2
  SEVERE [Main.logError]                             java.lang.ExceptionInInitializerError
         at com.turborilla.mule.view.MuleGameContainer.<init>(Unknown Source)
         at com.turborilla.mule.Main.main(Unknown Source)