Planet M.U.L.E.

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)

I'm not sure what can cause this but I suggest you double check that you're really running the game with Sun's Java Runtime. It might be that you have the Sun JRE Installed but your system is not using it.

Another thing to check is that you have proper sound drivers installed and try to close all programs running in the background.