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java.lang.NullPointerException: Root cannot be null	at javafx.scene.Scene.(Scene.java:336)	at javafx.scene.Scene.(Scene.java:223)	at fr.project.gui.Main.start(Main.java:44)	at com.sun.javafx.applet.FXApplet2$2.run(FXApplet2.java:134)	at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)	at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)	at java.lang.Thread.run(Thread.java:745)