Exception in thread "JavaFX Application Thread" java.lang.IllegalStateException: This operation is permitted on the event thread only; currentThread = JavaFX Application Thread
	at com.sun.glass.ui.Application.checkEventThread(com/sun/glass/ui/Application.java:443)
	at com.sun.glass.ui.Application.isNestedLoopRunning(com/sun/glass/ui/Application.java:544)
	at com.sun.javafx.tk.quantum.QuantumToolkit.isNestedLoopRunning(com/sun/javafx/tk/quantum/QuantumToolkit.java:1146)
	at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(com/sun/javafx/tk/quantum/QuantumToolkit.java:592)
	at javafx.stage.Stage.showAndWait(javafx/stage/Stage.java:474)
	at javafx.scene.control.HeavyweightDialog.showAndWait(javafx/scene/control/HeavyweightDialog.java:162)
	at javafx.scene.control.Dialog.showAndWait(javafx/scene/control/Dialog.java:341)
	at java.lang.reflect.Method.invoke(java/lang/reflect/Method.java:498)
	at org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(org/jruby/javasupport/JavaMethod.java:440)
	at org.jruby.javasupport.JavaMethod.invokeDirect(org/jruby/javasupport/JavaMethod.java:304)
	at RUBY.key_access_error(C:/Users/Daria/Documents/olimp-ng/util/secure_key/key_manager.rb:39)
	at RUBY.block in key_not_found_error(C:/Users/Daria/Documents/olimp-ng/util/secure_key/log_signer.rb:41)
	at org.jruby.RubyProc.call(org/jruby/RubyProc.java:286)
	at org.jruby.RubyProc.call(org/jruby/RubyProc.java:270)
	at org.jruby.javasupport.Java$ProcToInterface.callProc(org/jruby/javasupport/Java.java:1130)
	at org.jruby.javasupport.Java$ProcToInterface.access$300(org/jruby/javasupport/Java.java:1107)
	at org.jruby.javasupport.Java$ProcToInterface$ConcreteMethod.call(org/jruby/javasupport/Java.java:1168)
	at com.sun.javafx.application.PlatformImpl.lambda$null$172(com/sun/javafx/application/PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(com/sun/javafx/application/PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(com/sun/glass/ui/InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$147(com/sun/glass/ui/win/WinApplication.java:177)
	at java.lang.Thread.run(java/lang/Thread.java:748)