I meet a problem when I try to showing a map.

Uncaught TypeError: Cannot read property 'x' of undefined
    at d.<anonymous> (nav2d.min.js:1)
    at d.h.emit (roslib.min.js:1)
    at d._messageCallback (roslib.min.js:2)
    at d.h.emit (roslib.min.js:1)
    at b (roslib.min.js:2)
    at c (roslib.min.js:2)
    at WebSocket.onmessage (roslib.min.js:2)

It seems it's a problem with showing current location in map : The data format mismatch.

And I have some nother questions:

1. Is nav2djs support mutiple goal navigation? And how to do it?
2. Does the map support zooming and zomming in? If NO, how should I do it?
3. How does nav2d calculate goal point when I double click the map?

Thanks for your time!