Javascript 在Google Drive实时API中创建自定义对象时出错

好的，我正试图按照谷歌开发者指南，在谷歌实时API中创建一个协作自定义对象。然而，它目前运行良好，然而，当我尝试在模型中创建一个对象时（从注释中去掉initializeModel函数中的两行），我得到了错误“log:Net state changed from BUSY to CLIENT_error”。JavaScript中不会抛出错误。我不知道我哪里出了问题，任何帮助都将不胜感激。谢谢

        Project = function() {};
    registerTypes = function() {
        var custom = gapi.drive.realtime.custom;
        custom.registerType(Project, 'Project');                            
        Project.prototype.title = gapi.drive.realtime.custom.collaborativeField('title');
        Project.prototype.date = gapi.drive.realtime.custom.collaborativeField('date');
        Project.prototype.content = gapi.drive.realtime.custom.collaborativeField('content');
}
/**
 * Set up the model - when creating a new file or loading an existing one.
 */

// the model for the messages in the chat
var messages = undefined;
// the name of the authenticated user - once authentication has succeeded
var username = "unkown";
var realtimeLoader = undefined;

/**
 * Set up the model - when creating a new file or loading an existing one.*/
var initializeModel = function(model) {
    var messages = model.createList();
    var dealines2 = model.createList();
    /*var project1 = model.create("Project");*/
    model.getRoot().set('messages', messages);
    /*model.getRoot().set('project1', project1);*/
    model.getRoot().set('dealines2', dealines2);
    console.log(model.getRoot());
}

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你有没有叫过注册类型？在加载文档之前，需要注册类型