Groovy - SwingX - MultiSplitPane exception

[Josh Brown]

On the Groovy website, there's an example for the SwingXBuilder showing how to use a MultiSplitPane. I'm unable to get it to work, as it's throwing an IllegalArgumentException. I'm using Groovy 1.1-rc-1 with swingxbuilder-0.1.2.jar. Anybody know what might be wrong? The code is below:

import groovy.swing.SwingXBuilder
def swing = new SwingXBuilder()
def frame = swing.frame(size:[300,300], title:'JXMultiSplitPane Demo') {
multiSplitPane() {
split() {
leaf(name:"left")
divider()
leaf(name:"right")
}
button(text:"Left Button", constraints:"left")
button(text:"Right Button", constraints:"right")
}
}.show()

Here's the first part of the stack trace (the entire stack trace is really long and ugly):

java.lang.RuntimeException: Failed to create component for 'split' reason:
groovy.lang.GroovyRuntimeException: failed to invoke constructor: public groovy.swing.GroovySplit(groovy.util.Node[]) with arguments:
{[MultiSplitLayout.Leaf "center" weight=0.0 java.awt.Rectangle[x=0,y=0,width=0,height=0]]} reason:
java.lang.IllegalArgumentException: argument type mismatch
[ October 16, 2007: Message edited by: Josh Brown ]