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java.lang.NullPointerException: Input stream must not be null	at javafx.scene.image.Image.validateInputStream(Image.java:1001)	at javafx.scene.image.Image.(Image.java:624)	at javafxapplication1.guest.addHBox(guest.java:55)	at javafxapplication1.guest.start(guest.java:32)	at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)	at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:219)	at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:182)	at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:179)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)	at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:17)	at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:67)	at java.lang.Thread.run(Thread.java:745)