java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at games.stendhal.client.update.Bootstrap.boot(Bootstrap.java:296)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at games.stendhal.client.update.Starter.main(Starter.java:66)
Caused by: java.lang.IncompatibleClassChangeError: Found interface games.stendhal.client.Sprite, but class was expected
        at games.stendhal.client.gui.wt.EntitySlot.<init>(EntitySlot.java:75)
        at games.stendhal.client.gui.wt.Character.<init>(Character.java:90)
        at games.stendhal.client.gui.wt.SettingsPanel.<init>(SettingsPanel.java:89)
        at games.stendhal.client.gui.j2DClient.<init>(j2DClient.java:444)
        at games.stendhal.client.stendhal.startGameGUI(stendhal.java:142)
        at games.stendhal.client.stendhal.main(stendhal.java:157)
        ... 10 more