External Function with 5 parameters

Hello Everyone, I use a lot of External Functions in my ink code, without problems. But the last one I defined, has 5 parameters... And I don't know if that is a problem, but it doesn't work.

Here is my C# definition:
OBJECT.story.BindExternalFunction("EvaluarSkill", (string accionaevaluar, string personaje, int dificultad, string versus, string tipo) => { return EvaluarSkill(accionaevaluar, personaje, dificultad, versus, tipo); });

The C# error that I get is: "the delegate 'Func' cannot take 5 elements" or "the delegate 'Func' cannot take 5 arguments" in Unity

The C# function EvaluarSkill has 5 parameters, that is not the problem, and the EXTERNAL definition in ink has also 5 parameters

I have 20 EXTERNAL functions defined in the same way and all others work, except this one.

Can Anyone help me?

Thanks a lot!