sharepoint更新列表项（list item）出错

var siteUrl = '/sites/SEE/SitePages';
function createListItem(){
var clientContext = new SP.ClientContext(siteUrl);
    var oList = clientContext.get_web().get_lists().getByTitle('Feedback');
    var itemCreateInfo = new SP.ListItemCreationInformation();
    this.oListItem = oList.addItem(itemCreateInfo);
    oListItem.set_item('Title', 'My New Item!');
       oListItem.set_item('Context', 'Hello World!');
    oListItem.update();
    clientContext.load(oListItem);
   clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}

function onQuerySucceeded(){
       alert('Item created: ' + oListItem.get_id());
        }

function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

结果报错为Request failed. Unknown Error undefined

在线等，非常急！！

求大神们的帮助，感激不尽！！
[解决办法]
你把你网站的 home.aspx 这个页面的 url地址 发上来