Ender's client Java Error :( ?

[OsamabinLaden]

java.lang.Error: java.lang.reflect.InvocationTargetException
at haven.MainFrame.javabughack(MainFrame.java:393)
at haven.MainFrame.main2(MainFrame.java:406)
at haven.MainFrame.access$100(MainFrame.java:63)
at haven.MainFrame$8.run(MainFrame.java:476)
at java.lang.Thread.run(Unknown Source)