java.lang.RuntimeException: Exception in Application start method

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Exception in Application start method
java.lang.RuntimeException: Exception in Application start method	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)	at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.NullPointerException	at main.Main.start(Main.java:30)	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)	at com.sun.javafx.application.PlatformImpl.lambda$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.win.WinApplication._runLoop(Native Method)	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)	... 1 more