I didn't know what to do about, whenever i try to add animation this happens


An error occurred in the game, probablyGame or ModIf possible, Please send a screenshot of the error message and the action you took before triggering the error to developer: service@exlb.net
Thanks for your support of the game development
System.NullReferenceException: Object reference not set to an instance of an object.
at VPet.ModMaker.ViewModels.ModEdit.AnimeEdit.AnimePageVM.AddCommand_ExecuteCommand() in D:\Documents\Visual Studio 2022\Projects\VPet.ModMaker\VPet.ModMaker\ViewModels\ModEdit\AnimeEdit\AnimePageVM.cs:line 189
at HKW.HKWUtils.Observable.ObservableCommand.Execute(Object parameter) in C:\Users\HKW\Desktop\VS\HKW.Utils\HKW.Utils\Observable\ObservableCommand\ObservableCommand.cs:line 77
at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)