Phonegap date picker plugin not working

Phonegap date picker plugin not working

Seems like datepicker plugin has some issues using with cordova 2.9 gives
error
gap.addConstructor(function () {
if (gap.addPlugin) {
gap.addPlugin("datePicker", DatePicker);
} else {
if (!window.plugins) {
window.plugins = {};
}
window.plugins.datePicker = new DatePicker();
}
});
gap is always undefined!!! can not call method add constructor of undefined