when startup i get this error

[anonymous]

What steps will reproduce the problem?

1. start josm 19423
2. open .jos file for background layers
3. error

What is the expected result?

What happens instead?

Please provide any additional information below. Attach a screenshot if possible.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2025-07-11 10:12:51 +0200 (Fri, 11 Jul 2025)
Revision:19423
Build-Date:2025-07-12 01:30:35
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19423 en) Windows 11 64-Bit
OS Build number: Windows 10 Home 24H2 (26100)
Memory Usage: 350 MB / 4066 MB (126 MB allocated, but free)
Java version: 17.0.10+13-LTS, BellSoft, OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080x32bpp@60Hz (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_NL
Numbers with default locale: 1234567890 -> 1234567890

Plugins:
+ FastDraw (36438)
+ alignways (36438)
+ touchscreenhelper (36438)
+ utilsplugin2 (36438)

Last errors/warnings:
- 00000.573 W: extended font config - overriding 'filename.Myanmar_Text=mmrtext.ttf' with 'MMRTEXT.TTF'
- 00000.575 W: extended font config - overriding 'filename.Mongolian_Baiti=monbaiti.ttf' with 'MONBAITI.TTF'
- 00079.394 W: java.net.UnknownHostException: geodata.nationaalgeoregister.nl
- 00079.496 W: java.net.UnknownHostException: geodata.nationaalgeoregister.nl
- 00079.512 E: org.openstreetmap.josm.tools.bugreport.ReportedException: java.lang.IllegalArgumentException: java.net.UnknownHostException: geodata.nationaalgeoregister.nl. Cause: java.lang.IllegalArgumentException: java.net.UnknownHostException: geodata.nationaalgeoregister.nl. Cause: java.net.UnknownHostException: geodata.nationaalgeoregister.nl
- 00079.566 E: Handled by bug report queue: java.lang.IllegalArgumentException: WMTSLayer [info=DKK Kadastralekaart v4 grens (OSM OK)(wmts)[] ('Worldwide) - https://geodata.nationaalgeoregister.nl/kadastralekaart/wmts/v4_0?SERVICE=WMTS&request=GetCapabilities - WMTS] is not managed by us.



=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: AWT-EventQueue-0 (23) of main
java.lang.IllegalArgumentException: WMTSLayer [info=DKK Kadastralekaart v4 grens (OSM OK)(wmts)[] ('Worldwide) - https://geodata.nationaalgeoregister.nl/kadastralekaart/wmts/v4_0?SERVICE=WMTS&request=GetCapabilities - WMTS] is not managed by us.
	at org.openstreetmap.josm.gui.layer.LayerManager.checkContainsLayer(LayerManager.java:396)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.realSetActiveLayer(MainLayerManager.java:286)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.lambda$setActiveLayer$1(MainLayerManager.java:280)
	at org.openstreetmap.josm.gui.util.GuiHelper.runInEDTAndWaitWithException(GuiHelper.java:247)
	at org.openstreetmap.josm.gui.layer.MainLayerManager.setActiveLayer(MainLayerManager.java:280)
	at org.openstreetmap.josm.actions.SessionLoadAction$Loader.addLayers(SessionLoadAction.java:147)
	at org.openstreetmap.josm.actions.SessionLoadAction$Loader.lambda$finish$0(SessionLoadAction.java:133)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117)
	at java.desktop/java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:191)
	at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:236)
	at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:234)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
	at java.desktop/java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:234)
	at java.desktop/java.awt.Dialog.show(Dialog.java:1080)
	at java.desktop/java.awt.Component.show(Component.java:1728)
	at java.desktop/java.awt.Component.setVisible(Component.java:1675)
	at java.desktop/java.awt.Window.setVisible(Window.java:1036)
	at java.desktop/java.awt.Dialog.setVisible(Dialog.java:1016)
	at org.openstreetmap.josm.gui.progress.swing.PleaseWaitProgressMonitor.lambda$doBeginTask$3(PleaseWaitProgressMonitor.java:255)
	at org.openstreetmap.josm.gui.progress.swing.PleaseWaitProgressMonitor.lambda$doInEDT$0(PleaseWaitProgressMonitor.java:113)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[stoecker]

If possible and not containing private data please attach the session file.