java.lang.IllegalStateException: showAndWait is not allowed during animation or layout processing
	at javafx.scene.control.Dialog.showAndWait(Dialog.java:328)
	at org.jabref.gui.FXDialogService.showErrorDialogAndWait(FXDialogService.java:146)
	at org.jabref.FallbackExceptionHandler.uncaughtException(FallbackExceptionHandler.java:22)
	at java.lang.ThreadGroup.uncaughtException(Unknown Source)
	at java.lang.ThreadGroup.uncaughtException(Unknown Source)
	at com.sun.scenario.animation.shared.TimelineClipCore.visitKeyFrame(TimelineClipCore.java:241)
	at com.sun.scenario.animation.shared.TimelineClipCore.playTo(TimelineClipCore.java:180)
	at javafx.animation.Timeline.impl_playTo(Timeline.java:176)
	at javafx.animation.AnimationAccessorImpl.playTo(AnimationAccessorImpl.java:39)
	at com.sun.scenario.animation.shared.SingleLoopClipEnvelope.timePulse(SingleLoopClipEnvelope.java:99)
	at javafx.animation.Animation.impl_timePulse(Animation.java:1102)
	at javafx.animation.Animation$1.lambda$timePulse$25(Animation.java:186)
	at java.security.AccessController.doPrivileged(Native Method)
	at javafx.animation.Animation$1.timePulse(Animation.java:185)
	at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:344)
	at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:267)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:514)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:498)
	at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:491)
	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$403(QuantumToolkit.java:319)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
	at java.lang.Thread.run(Unknown Source)