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At first, I wanted to use this to edit a save I had in a mod, but it wouldn't open
So then I tried just the base mod, no saves, that wouldn't open
So then I tried vanilla CK2, no mods, that wouldn't open

Works fine for EU4 though. :|

I've used previous versions of this editor to great effect, not sure why it isn't working post-MnM
 
When I Tried To Use This, When Loading Characters, It Said

Code:
Exception in thread "main" java.lang.IllegalArgumentException: Partial cannot be null
at org.joda.time.base.AbstractPartial.isAfter(AbstractPartial.java:351)
at editor.beans.Person.init(Person.java:157)
at editor.beans.Person.<init>(Person.java:65)
at eug.specific.clausewitz.ClausewitzScenario.preloadCharacters(ClausewitzScenario.java:317)
at editor.MapPanelDataModel.preloadCharacters(MapPanelDataModel.java:178)
at editor.MapPanel.setDataSource(MapPanel.java:566)
at editor.EditorUI.setDataSource(EditorUI.java:480)
at editor.EditorUI.<init>(EditorUI.java:142)
at editor.Main.main(Main.java:32)
 
When I Tried To Use This, When Loading Characters, It Said

Code:
Exception in thread "main" java.lang.IllegalArgumentException: Partial cannot be null
at org.joda.time.base.AbstractPartial.isAfter(AbstractPartial.java:351)
at editor.beans.Person.init(Person.java:157)
at editor.beans.Person.<init>(Person.java:65)
at eug.specific.clausewitz.ClausewitzScenario.preloadCharacters(ClausewitzScenario.java:317)
at editor.MapPanelDataModel.preloadCharacters(MapPanelDataModel.java:178)
at editor.MapPanel.setDataSource(MapPanel.java:566)
at editor.EditorUI.setDataSource(EditorUI.java:480)
at editor.EditorUI.<init>(EditorUI.java:142)
at editor.Main.main(Main.java:32)
That might be because this tool was last updated years ago.