Setting style "-fx-background-fills:green 10 10;" throws ClassCastException :

WARNING: com.sun.javafx.css.StyleHelper transitionToState Failed to set css [StyleableProperty {property: -fx-background-fills, converter: BackgroundFillsType, initalValue: null, inherits: false, subProperties: [StyleableProperty {property: -fx-background-color, converter: Paint.SequenceConverter, initalValue: [Ljavafx.scene.paint.Paint;@379faa8c, inherits: false, subProperties: []}, StyleableProperty {property: -fx-background-radius, converter: InsetsSequenceConverter, initalValue: [Ljavafx.geometry.Insets;@5375e9db, inherits: false, subProperties: []}, StyleableProperty {property: -fx-background-insets, converter: InsetsSequenceConverter, initalValue: [Ljavafx.geometry.Insets;@624c53ab, inherits: false, subProperties: []}]}]

java.lang.ClassCastException: javafx.scene.paint.Color cannot be cast to java.util.List
at javafx.scene.layout.Region$16.set(Region.java:1048)
at com.sun.javafx.css.StyleableObjectProperty.applyStyle(StyleableObjectProperty.java:58)
at com.sun.javafx.css.StyleableProperty.set(StyleableProperty.java:70)
at com.sun.javafx.css.StyleHelper.transitionToState(StyleHelper.java:902)
at javafx.scene.Node.impl_processCSS(Node.java:7415)
at javafx.scene.Parent.impl_processCSS(Parent.java:1146)
at javafx.scene.Node.processCSS(Node.java:7383)
at javafx.scene.Node.processCSS(Node.java:7377)
at javafx.scene.Node.processCSS(Node.java:7377)
at javafx.scene.Scene.doCSSPass(Scene.java:443)
at javafx.scene.Scene.access$3800(Scene.java:169)
at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2198)
at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:363)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:460)
at com.sun.javafx.tk.quantum.QuantumToolkit$9.run(QuantumToolkit.java:329)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:82)
at java.lang.Thread.run(Thread.java:722)