Getting the same here. My log_init.txt follows...
INFO [Properties.<init>] VERSION: 1.3.6
INFO [Properties.<init>] Classpath: ./data.jar
INFO [Properties.<init>] Java VM: 23.21-b01
INFO [Properties.<init>] Java Runtime: 1.7.0_21-b11
INFO [Properties.<init>] OS: Linux 3.11.0-18-generic i386
INFO [Properties.<init>] Java Library Path: lib
INFO [Properties.<init>] Max Memory: 238616576
INFO [Properties.<init>] Avaialble Processors: 2
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 [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: null
INFO [Login$MasterListener$1.run] You must select your species to login
INFO [MasterClient.setServerAddress] MasterClient: Address
http://www.planetmule.com/server INFO [MasterClient.logSend] MasterClient: Sending Login
INFO [MasterClient.apply] MasterClient: Session ID: 61eep8oa3tl7h53ajs0kbfpbp4
INFO [Login$MasterListener$1.run] Logged in as "awfulnewbie" (id 102103)
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>(MuleGameContainer.java:75)
at com.turborilla.mule.Main.main(Main.java:170)