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Root cannot be null
java.lang.NullPointerException: Root cannot be null at javafx.scene.Scene.<init>(Scene.java:336) at javafx.scene.Scene.<init>(Scene.java:194) at main.Scenes.LibraryScene.LibraryScene.build(LibraryScene.java:65) at main.Scenes.SceneFactory.BuildScene(SceneFactory.java:27)