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kotlinlang

I'm trying to adapt some examples of "bindChildren" I see on StackExchange: I want to bind some "ShapeItems" I'm storing in an observable list in my "ShapeLibrary" model to a flowpane. I'm getting a `java.lang.IllegalStateException: shapeItem.name must not be null` error even though I'm making sure to set the name property of two test shapeItems before adding them to the list. Is this error arising because the binding itself isn't right? Thanks for any thoughts.