Can't run it! (System.ArgumentNullException problem)

Hi
I can't seem to fix the problem, tried whichever solution that was posted here but none worked.
Here's the error message I've been getting: (since it was in portuguese, I roughly translated it based on others errors I found here, may be a little flawed though)
The Sims 4 Studio - Version 3.1.3.4
System.AggregateException: One or more errors ocurred. ---> System.ArgumentNullException: Value cannot be null.
Parameter name: path1
at S4Studio.Shared.AppModel.DoInit()
in System.Threading.Tasks.Task.InnerInvoke()
in System.Threading.Tasks.Task.Execute()
--- End of stack trace from internal exception ---
---> (Internal Exception N° 0) System.ArgumentNullException: Value cannot be null.
Parameter name: path1
at S4Studio.Shared.AppModel.DoInit()
in System.Threading.Tasks.Task.InnerInvoke()
in System.Threading.Tasks.Task.Execute()<---

ORIGINAL MESSAGE (portuguese):

The Sims 4 Studio - Version 3.1.3.4
System.AggregateException: Um ou mais erros. ---> System.ArgumentNullException: Valor não pode ser nulo.
Nome do parâmetro: path1
em S4Studio.Shared.AppModel.DoInit()
em System.Threading.Tasks.Task.InnerInvoke()
em System.Threading.Tasks.Task.Execute()
--- Fim do rastreamento de pilha de exceções internas ---
---> (Exceção Interna N° 0) System.ArgumentNullException: Valor não pode ser nulo.
Nome do parâmetro: path1
em S4Studio.Shared.AppModel.DoInit()
em System.Threading.Tasks.Task.InnerInvoke()
em System.Threading.Tasks.Task.Execute()<---