java.lang.RuntimeException: java.lang.NullPointerException: Root cannot be null

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java.lang.RuntimeException: 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$173(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl.lambda$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)

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