Unable to get property 'push" of undefined or null reference when calling list.push (WINJS List function)

Question

            var appsList = WinJS.Binding.List();

            WinJS.xhr({ url: "http://localhost:52241/Myservice.svc/getApps" }).then(function (xhr) {
                var apps = JSON.parse(xhr.response);                
                apps.forEach(function (i) {
                    appsList.push({
                        applicationId: i.ApplicationId,
                        applicationName: i.ApplicationName
                    });                    
                });

I am trying to bind a JSON object data to a WINJS list (for windows 8 app). I am getting the above error when calling the list with "push". Not sure whats going wrong here. Any tips to resolve this issue.

Here is my JSON data for reference:

[{"ApplicationId":1,"ApplicationName":"ABC","GroupId":1},{"ApplicationId":2,"ApplicationName":"DEF3","GroupId":2},{"ApplicationId":3,"ApplicationName":"ABC1","GroupId":2},{"ApplicationId":4,"ApplicationName":"DEF2","GroupId":2},{"ApplicationId":5,"ApplicationName":"FGH1","GroupId":3},{"ApplicationId":6,"ApplicationName":"FGH2","GroupId":3},{"ApplicationId":7,"ApplicationName":"IJK","GroupId":3},{"ApplicationId":8,"ApplicationName":"IJK1","GroupId":3}]