Error when starting up

[ARobertDev]

java.util.zip.ZipException: zip END header not found
	at java.base/java.util.zip.ZipFile$Source.zerror(Unknown Source)
	at java.base/java.util.zip.ZipFile$Source.findEND(Unknown Source)
	at java.base/java.util.zip.ZipFile$Source.initCEN(Unknown Source)
	at java.base/java.util.zip.ZipFile$Source.<init>(Unknown Source)
	at java.base/java.util.zip.ZipFile$Source.get(Unknown Source)
	at java.base/java.util.zip.ZipFile.<init>(Unknown Source)
	at java.base/java.util.zip.ZipFile.<init>(Unknown Source)
	at java.base/java.util.zip.ZipFile.<init>(Unknown Source)
	at pl.betoncraft.betonquest.editor.model.PackageSet.loadFromZip(PackageSet.java:126)
	at pl.betoncraft.betonquest.editor.BetonQuestEditor.loadPreviousData(BetonQuestEditor.java:149)
	at pl.betoncraft.betonquest.editor.BetonQuestEditor.start(BetonQuestEditor.java:102)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(Unknown Source)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(Unknown Source)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
	at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
	at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)