Crash on opening encyclopedia, help?

[Heivenner]

Im creating a mod, it all works fine ive added a lot of lords, settlements, navmeshes etc etc. However when I added a new series of lords and settlements Im getting this error when I open up the encyclopedia (it runs fine until I open it.)

at TaleWorlds.CampaignSystem.Encyclopedia.Pages.DefaultEncyclopediaHeroPage.d__1.MoveNext()
at TaleWorlds.CampaignSystem.ViewModelCollection.Encyclopedia.EncyclopediaList.EncyclopediaListVM..ctor(EncyclopediaPageArgs args)
at SandBox.GauntletUI.EncyclopediaData..ctor(GauntletEncyclopediaScreenManager manager, ScreenBase screen, EncyclopediaHomeVM homeDatasource, EncyclopediaNavigatorVM navigatorDatasource)
at SandBox.GauntletUI.GauntletEncyclopediaScreenManager.ExecuteLink(String pageId, Object obj, Boolean needsRefresh)
at TaleWorlds.CampaignSystem.ViewModelCollection.Encyclopedia.EncyclopediaNavigatorVM.ExecuteLink(String pageId, Object target)
at SandBox.View.Map.MapScreen.TaleWorlds.CampaignSystem.IMapStateHandler.AfterWaitTick(Single dt)
at TaleWorlds.CampaignSystem.MapState.OnMapModeTick(Single dt)
at TaleWorlds.CampaignSystem.MapState.OnTick(Single dt)
at TaleWorlds.Core.GameStateManager.OnTick(Single dt)
at TaleWorlds.Core.Game.OnTick(Single dt)
at TaleWorlds.Core.GameManagerBase.OnTick(Single dt)
at TaleWorlds.MountAndBlade.Module.OnApplicationTick_Patch1(Module this, Single dt)