Error on Loadup

[SoyGoy]

java.lang.NullPointerException
	at pl.betoncraft.betonquest.editor.persistence.PreviousState.<init>(PreviousState.java:61)
	at pl.betoncraft.betonquest.editor.persistence.Persistence.<init>(Persistence.java:53)
	at pl.betoncraft.betonquest.editor.BetonQuestEditor.start(BetonQuestEditor.java:96)
	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)
	at java.lang.Thread.run(Unknown Source)

[AllegorickBlock]

You have an error in you quest file