[Vala] Single instance...

["Luis L. Rodríguez Oro" <luisr uci cu>]

When I try to run this code show error "Violación de segmento". Any 
ideas to fix it?
I want to run a single instance of my app.

//valac valac --pkg unique-1.0
using Unique;

int main(string[] args){
    Unique.App app = new Unique.App("org.centinela.unique", null); 
//Error here!

    if(app.is_running) {
        print("is running... take arguments and do something...\n");
        return 0;
    }

    print("OK, no problem....\n");
    return 0;
}

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