Uncaught TypeError: Cannot read property 'get' of undefined - How do I solve this?

Question

Parse.com and JavaScript SDK.

I'm sure its simple, but I cannot seem to understand of fix the uncaught type error shown below. Why is this happening?

var Events = Parse.Object.extend("event");
var query = new Parse.Query(Events);
query.include("parent");

query.find({
    success: function(events) {
        for (var i = 0; i < events.length; i++) {
            var event = events[i];
            var zone = event.get("parent");
            console.log(zone.get("name"));              
        }
    },
    error: function(error) {
        alert(error);
    }
});

Answer 1

if i'm correct - include stop working. I have cloud code which worked two days ago and not working today. I used include in query, and it returns 'undefined' value today.

Answer 2

问题是类“ zone”没有“名称”字段”，因此console.log返回“未定义”。