i'm getting an error msg:

TypeError: Cannot call method "showContacts" of undefined

any help here?

b9.addEventListener('click', function(){

Titanium.Contacts.showContacts({
selectedPerson: function(e) {
    if (e.property == 'phone') {
        Ti.API.log(e.label + ": " + e.value);
    }
}
});

});