Help anonimous group

What's the sintaxix for an anonimous group ?

Using :

(vla-add (vla-get-groups
(vla-get-activedocument (vlax-get-acad-object))
)
"*"
)
gives me an error

; error: Automation Error. Invalid argument Name in Add method

Any idea?

Thanks

 

Hi...

Hmmmm... It work well for me...

(defun addGrupo (nombre)
(vla-add (vla-get-groups
(vla-get-activedocument (vlax-get-acad-object))
)
nombre
)
) ;_defun

(addGrupo "Hola") or (addGrupo "*"), it wok well...

Look:
Command: (addgrupo "Hola")
#<VLA-OBJECT IAcadGroup 00feb5a4>

Command: (addgrupo "*")
#<VLA-OBJECT IAcadGroup 00fe89e4>