I've prove in many different way and every time there is a different error. I don't know if it is for skype version or not. However I've done the VI as yours, and he tells me about error 97. The thing i don't understand is that the error arises in the first sub, the "launch one" as you can see in the screenshot made in highlight execution, but the subVI lanch works right in other situation! If I remove the sub lanch (because skype is already open), appears the 80020009 error, as I already told.
And I have already prove with + and country code!