无法解析嵌套的foreach淘汰赛的绑定

Question

我有以下HTML代码

   <div id="Main" >
        <div id="Clusters" data-bind="foreach: clusters">
            <div id="Scenarios" data-bind="foreach: scenarios">
                <div id="ChoiceLists" data-bind ="foreach: choicelists" >
                    <div id="Forwards" data-bind ="foreach: forwards">
                        <span data-bind="text: code"></span>
                        <span data-bind="text: desc"></span><input type="radio" data-bind="value: code" /><br />
                    </div>
                </div>
            </div>
        </div>
    </div>

以下是上述html的脚本

$（function（）{

var binding;

function MainEntries(data) {
    this.code = data.code;
    this.desc = data.desc;
    this.clusters = ko.observableArray($.map(data.clusters, function (cluster) { return new Cluster(cluster) }));
}

function Cluster(data) {
    var self = this;
    self.scenarios = ko.observableArray($.map(data.scenarios, function (scenario) { return new Scenario(scenario) }));
}

function Scenario(data) {
    this.choicelists = ko.observableArray($.map(data.choicelists, function (choicelist) { return new ChoiceList(choicelist) }));
}

function ChoiceList(data) {
    this.forwards = ko.observableArray($.map(data.forwards, function (forward) { return new Forward(forward) }));
}

function Forward(data) {
    this.id = ko.observable(data.id);
    this.code = ko.observable(data.code);
    this.desc = ko.observable(data.desc);
}

 function DisplayClusters(selectedCode) {

    $.getJSON("/home/clusters", "code=" + selectedCode, function (data) {
                    binding = new MainEntries(data);

                });
}

ko.applyBindings(binding);

}）;

我正在调用DisplayClusters（）并传递代码，以便它会对我的一个服务和显示数据执行json调用但是它会抛出无法找到绑定“cluster”的错误

我确信数据来自服务，它只是不显示...因为这个错误。我绑定的错误是什么？淘汰赛我有点新鲜。