Sims 4 Studio 3.2.1.5 (Star) Problem/Error.

Hello. I have a question about Error in Sims 4 Studio 3.2.1.5 (Star). Why, when I click in Tuning Editor and after when I click on Add (Add Resource), and I select example "Buff", it is added to my package, but, when I click on "buffs", write it some Error? Is some difference between "Buff" and "buffs" Resources? Or why, I can´t add "buffs", but "Buff" yes? Why "Buff" resouce is added but "buffs" no? Here is text of Error,  which is written after when I try add "buffs"


The Sims 4 Studio - Version 3.2.1.5

System.ArgumentNullException: Value cannot be null. (Parameter 'key')

at System.Collections.Generic.Dictionary`2.FindValue(TKey key)

at System.Collections.Generic.Dictionary`2.ContainsKey(TKey key)

at S4Studio.Data.IO.Tuning.TuningResourceBase.GetTypeId(String name) in \\mac\thes4studio\TheS4Studio\S4Studio.Shared\IO\Tuning\TuningResourceBase.cs:line 364

at S4Studio.TuningEditor.Models.TuningEditorModel.<.ctor>b__22_8() in \\mac\thes4studio\TheS4Studio\S4Studio.Shared\ViewModels\Tuning\TuningEditorModel.cs:line 276

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)


Thanks for help. I don´t understand it.