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This exception has no message.
java.lang.NullPointerException: 	at javafx.scene.CssStyleHelper.updateParentTriggerStates(CssStyleHelper.java:194)	at javafx.scene.CssStyleHelper.createStyleHelper(CssStyleHelper.java:173)	at javafx.scene.Node.reapplyCss(Node.java:8983)	at javafx.scene.Node.impl_reapplyCSS(Node.java:8946)	at javafx.scene.Node.invalidatedScenes(Node.java:854)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Parent.scenesChanged(Parent.java:667)	at javafx.scene.Node.invalidatedScenes(Node.java:853)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Parent.scenesChanged(Parent.java:667)	at javafx.scene.Node.invalidatedScenes(Node.java:853)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Parent.scenesChanged(Parent.java:667)	at javafx.scene.Node.invalidatedScenes(Node.java:853)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Parent.scenesChanged(Parent.java:667)	at javafx.scene.Node.invalidatedScenes(Node.java:853)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Parent.scenesChanged(Parent.java:667)	at javafx.scene.Node.invalidatedScenes(Node.java:853)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Parent.scenesChanged(Parent.java:667)	at javafx.scene.Node.invalidatedScenes(Node.java:853)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Scene$9.invalidated(Scene.java:1119)	at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)	at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)	at javafx.scene.Scene.setRoot(Scene.java:1072)	at javafx.scene.Scene.(Scene.java:347)	at javafx.scene.Scene.(Scene.java:223)	at de.qabel.desktop.ui.AbstractGuiTest.launchNode(AbstractGuiTest.java:55)