I have had Nodebox crash on me repeatedly when trying to follow the "animation" tutorial. It always happens when I create a "delete" node (where the tutorial indicates "In order to remove the parts without overlap..."). I can choose to ignore the error, but it inevitably is thrown again and I can't use the "delete" node.

The message provided on the most recent crash is pasted below. I am running Ubuntu Studio 14.04 (Trusty Tahr) 64-bit. Can anyone help with this?

java.lang.AbstractMethodError: java.lang.Throwable.getMessage()Ljava/lang/String;
at nodebox.ui.ExceptionDialog.(Unknown Source) at nodebox.ui.ExceptionDialog.(Unknown Source) at nodebox.client.Application$2$1.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:694) at java.awt.EventQueue$3.run(EventQueue.java:692) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:703) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)